As Donald attempts to repair Bree's damaged chip, the replacement chip  keeps malfunctioning, much to Donald's frustration. Although Leo  believes Douglas can help since he was the original creator, Donald  refuses to even see his brother again. Realizing Donald won't change his  mind, Leo finds Douglas, anyway, who reluctantly agrees to help. While  Donald is away, Douglas creates a new chip as close to the original as  possible, and though it seems to work, it also malfunctions by causing  Bree to run uncontrollably. Donald finds Leo with Douglas at the lab,  but helps out and all three manage to keep Bree still; however, they  still can't find a solution. After several minutes, they finally find  the error and collaborate for the first time in years, fixing Bree's  chip and saving her life. Meanwhile, Adam and Chase try to find a way to  replace Bree's speed. While Chase manages to power up Donald's  motorcycle to go 350-400 MPH, it runs out of gas almost instantly. After  Bree's chip is fixed, Donald still kicks out his brother. While  watching Bree apologize for her mistake, Donald realizes everyone  deserves a second chance. The next morning, Donald offers his brother a  chance to move in with them temporarily, and he accepts.

Which Father Knows Best?

William Brent

Spencer Boldman

Kelli Berglund

Tyrel Jackson Williams

Hal Sparks

Cyborg Shark Attack

Three Minus Bree

Leo and Donald escape the elevator. Principal Perry lets them stay at  the school temporarily in order to get her money from Donald quicker.  The Lab Rats stow away on a cargo ship to hide from the FBI and must  choose to either keep quiet or help stop a submarine that will crash  into the ship and risk being caught. The Lab Rats decide to stop the  submarine, with Chase activating his GPS, revealing the Lab Rats'  location. Douglas ends up capturing them, disguised as Donald. Douglas  reveals that his new bionic partner is a billionaire named Victor Krane,  who wants to destroy the Lab Rats permanently. When Donald calls the  Lab Rats and tells them that Principal Perry kept their secret, they  return home, only for them to get crazy as a result of the Triton App  and attack the family, Leo manages to disable Chase's Triton App when he  talks to him and Chase manages to disable Adam and Bree's apps. The Lab  Rats and the family later see the demolition that happened to the lab  and are upset.

Sink or Swim (1)

Sink or Swim (2)

Since the lab is destroyed, the Lab Rats go without their capsules. This  causes glitches in their bionics. In order to prevent this, Donald  pulls off a huge stunt in a fiberglass jet wing he invented. Things go  wrong when the jet wing runs out of fuel. Meanwhile, knowing the Lab  Rats' bionic secret, Principal Perry uses Adam and Bree as her bionic  servants for the day.

The Jet-Wing

Since Principal Perry knows that the Lab Rats are bionic, she wants  to get in the action and go on a mission with them. When they stage a  fake mission and take her down to the newly built lab, things don't go  as planned, and they have to save Mission Creek High from a speeding  rocket. Meanwhile, Janelle goes on a date with Leo, but is beginning to  see him as a jinx because she always gets hurt when he is around.

Mission: Mission Creek High

Bree gets a part-time job at a tech-support store with Caitlin, but gets  out-shined by Chase while he is talking to the manager of Tech Town,  Scott. Chase sees how she feels later and they agree to treat each other  with respect. Meanwhile, while Tasha is away visiting Grandma Rose, Leo  and Adam make a turbo zip-line instead of doing the chores that Tasha  gave them, with Donald joining them later. When Tasha finds out about  the zip-line, she makes the boys do the chores and she hangs out on the  turbo zip-line instead, much to the dismay of Adam, Leo, and Donald.

Zip It

Chase loses the phone with a bowling video of him and Adam doing bionic  bowling stunts at Tech Town while working. Leo and Bree try to get  Principal Perry to spend her money when she retires after Donald gives  her money and Trent becomes the principal and makes Leo's life  miserable. It works in the end, but Principal Perry is broke and Scott  fires Caitlin after she destroys an ePhone 7, the one that had Adam and  Chase's bowling stunts on it, while giving them to the customers as  revenge. Leo makes Trent wear a different uniform, but to Bree and Leo's  shock, he loves it, much to their dismay.

Not So Smart Phone

Leo invents his first high-end technological creation, a pair of attack  orbs meant to protect the family, but when they can't differentiate  between friend and enemy, they create more bad than good. Meanwhile,  Chase steals Donald’s Eddy technology to make a Cheddy application to  win a Tech Town employee contest and beat Scott, but things go wrong  when the technology doesn't work as expected. Leo and Tasha go to see  Janelle's play which Adam is starring in, but when Trent steals Leo's  ticket, Leo and Trent ruin her play, much to Adam and Janelle's dismay.

Scramble the Orbs

During a lunar eclipse, Principal Perry arrives at the house to inform  everyone that aliens are on the planet, much to the cha Bree, Chase, and  Donald's chagrin, but Adam and Leo's shock. She insists that Chase's  upset stomach is due to an alien growing inside him and chases him.  However, they notice green goop leaking out of Principal Perry's ears  and mouth. Donald then admits that she's an alien. Principal Perry  chases everyone, while Leo records the whole thing, and eventually tires  herself out. Leo accidentally wakes her and she runs off with him to  the school. Adam's heat vision destroys the alien pods Principal Perry  laid and Leo is freed. The mother ship beams Principal Perry away just  as Donald arrives. Thinking that they will miss Principal Perry, they  are sadly mistaken when the mother ship beams alien-less Principal Perry  back down. It is then revealed the whole thing was Leo's entrant in a  contest.

Principal from Another Planet

Donald shows a new motorcycle to the Lab Rats when they get a video  message from Douglas that Krane has lost it and implanted himself with  more bionic abilities, abilities even he doesn't know about. The Lab  Rats instead believe this to be a trap, leading Donald to activate a new  security system that only he can bypass. While Leo is at Mission Creek  High School, Douglas arrives and tries to appeal to Leo by reminding him  that he knew about Douglas and Marcus before the rest of them. Douglas  then shows Leo video footage of Krane implanting himself with bionics  and asks him to call his brother to prove his honesty. Back at the lab, a  transmission comes in and shows Leo and Tasha captured. While Donald  thinks it's Douglas, Krane reveals himself on-screen as the captor and  demands that the Lab Rats arrive in 10 minutes. While the Lab Rats want  to rescue them, Donald heads out alone with an extremely powerful  thermal blaster. Donald arrives at Krane's lair, only for Krane to  siphon the power from the blaster, rendering it useless and quickly  beating Donald with super strength and molecularkinesis. During the  battle, Leo and Tasha are trapped in an exothermic energy field to fry  them. Afterward, Krane geo-leaps to the lab, allowing Donald to use the  thermal blaster to suck in the heat to set Leo and Tasha free. As Chase  works to deactivate the security system, Krane arrives and easily beats  the Lab Rats with his more advanced bionics. Before Krane can finish  them off, Douglas arrives and blasts Krane with a laser blaster.  Although he saves the Lab Rats, Krane quickly recovers and knocks him  down with another force wave. As he once again prepares to attack, Chase  repels his blast back at him with a force-field, defeating him for  good. Douglas plans to capture the unconscious Krane, but Donald arrives  and blames the entire mess on him. Unfortunately, Krane geo-leaps out  of the house and Donald demands that Douglas leaves.

Taken

Bree is accepted for a semester abroad program in Australia, but when  Donald learns about it, he refuses to let her go. When Donald again  refuses to let her go to a concert with her friends in favor of bionic  chip maintenance, she decides she's had enough and smashes her bionic  chip, much to Adam, Chase, and Donald's horror. At first, Bree relishes  her new freedom and even begins bragging to a disgruntled Leo. During a  mission, Bree feels helpless as Adam and Chase are gone for hours. Chase  reveals that they barely made it out alive and because Bree is no  longer bionic, the mission took twice as long. Bree realizes she was  selfish and apologizes to Adam and Chase. She's ready to become bionic  again, but Donald sadly tells her that since Douglas built the chips, he  isn't sure if Bree will ever be bionic again. Meanwhile, Tasha is sick,  so Leo decides to use his new pill invention on her to see if her  diagnosis will reveal the problem, but when he takes some of the  software from Eddy, Eddy is stuck in Tasha's body. Eddy spends the day  dressing her horribly and getting her kicked out of every spot in town.  Donald finally uses his nasal vacuum on Eddy and the pill is extracted.  However, Eddy reveals he did a news report as Tasha, and much to her  shock, he made her look like a complete buffoon.

Leo's scared by a shark movie, so Adam and Chase use one of Donald's  sharks to scare him, but it goes haywire and Adam, Chase, Leo, and  Janelle end up stuck in the house. In the end, Leo turns the sharks off.  Meanwhile, Principal Perry enlists Bree and Donald's help to get into a  country club, but when she lies that Donald is her husband and Bree is  her daughter and they have pottery around the world, Bree must use super  speed to go places without the country club owner knowing about her  bionics. Eventually, Principal Perry doesn't get in after the manager  figures out the lies, but she decides to spend the summer with the  Davenports.

When the Lab Rats are on a mission, it is revealed that a girl was  secretly recording them behind a bush. The next day, the Lab Rats go to  school and everyone is looking at a viral video called The World's First Bionic Humans.  They go back home to tell Donald, but he says he already knows.  Meanwhile, Chase is confused that he didn't notice the girl who filmed  them behind the bush, even though he thermal scanned the whole place. He  then looks at a chip log and finds out that the girl was in the exact  spot he scanned. Chase then goes to tell Donald, but a swarm of  government agents surrounds them. Leo and Douglas are still in the lab,  but they use a trap door to escape and go to school to stay safe. It is  then revealed that the mission the Lab Rats were on was a setup. Krane  then shows up with the girl who filmed the Lab Rats, whose name is  revealed to be S-1. It is also revealed that she is bionic. Krane  electrocutes Principal Perry and Douglas while S-1 crushes Leo's arm.  Later, Douglas and Principal Perry help Leo to get his arm fixed and  take him to the hospital. Tasha later shows up, only to realize that Leo  is gone. While the Lab Rats are saying their goodbyes, Special Agent  Graham tells them it's time to leave, but Adam refuses. Agent Graham  orders his agents to take them down, but Adam uses his wave blast  ability to knock them down. When they run to the hospital, Principal  Perry tells them Krane is responsible for exposing their bionics.  Meanwhile, Leo is in Douglas and Krane's old warehouse and Douglas tells  him to take his bandage off and pretend to throw a ball. He then  realizes that Douglas upgraded his right arm with bionics. Krane then  shows up and knocks down Leo and Douglas. The Lab Rats then show up with  Donald, as Krane uses a powerful bionic ability that knocks out Leo,  Donald, and the Lab Rats. Krane then paralyzes Donald with his choking  ability. Bree battles S-1 while Adam and Chase battle Krane, but he  easily takes them down with his newly upgraded Triton App that he uses  on S-1. Leo then uses his bionic arm to take down Krane. As Agent Graham  arrives, Douglas reveals that Krane and S-1 are the bionic villains.  Agent Graham is then saved by Bree as Krane tries to attack him and he  takes Krane and S-1 into custody and locks them in a prison with a  bionic signal interrupter, preventing them from using their bionics to  get out. Later, the Lab Rats are at a press conference and reveal that  they are bionic superhumans. While watching it, Principal Perry makes  new friends with the Lab Rats. In the end, Agent Graham tells Donald  he's now in charge of the Lab Rats. It is also revealed that Krane has  an army of bionic soldiers, which he will use to destroy the Lab Rats.

You Posted What!?! (1)

You Posted What!?! (2)

Leo tries to show off his bionic arm to Janelle. Meanwhile, Agent Graham  promotes the Lab Rats as bionic celebrities, but when they realize they  missed a mission because of him, they decide to get Donald back as  their leader by pretending to have glitches in their bionics to  humiliate Graham in front of the President of the United States when he  comes to visit them. In the end, Donald is back as their leader after  Agent Graham is fired by the president, arrested by the Secret Service,  and sent to prison.

Armed and Dangerous

Donald and the Lab Rats attend a fan convention about the movie, Alien  Gladiators. The Lab Rats queue up to meet Andre Ethier, but Caitlin  comes and makes them let her cut in line in front of them, getting the  lost spot and meeting Andre Ethier. They fight with Caitlin and are  thrown in a security holding area with a fanboy. Meanwhile, Leo and  Donald are taking part in the Fire Staff Competition to get the walk-in  role in the next Alien Gladiators movie.

Alien Gladiators

Chase feels that it is unfair to be picked on by Adam every time and  tells Donald. Douglas overhears and unlocks a new ability for Chase,  upsetting the balance in the house. Douglas tries to fix things by  giving Adam a new ability as well, but Adam and Chase end up fighting  with one another. Meanwhile, Bree tells Leo about a contest at Tech Town  as they are about to hit their one-millionth customer and Leo competes  to ride on the first anti-gravity roller coaster and meet the owner of  Tech Town. Principal Perry tries to compete to crush Leo's dream. In the  end, Chase and Adam have a death battle, but eventually forgive each  other and find out that Douglas gave Bree the ability to go invisible,  scaring everyone in the lab.

Brother Battle

Chase gets a girl interested in him, but Adam gets jealous and tries to  ruin their date by having Chase turn back into Spike. Meanwhile, Leo and  Bree suspect that Principal Perry has murdered a cook from the  cafeteria and Donald. They then find out it was about a hamburger truck  and they misunderstood everything.

Spike Fright

Bree wants to get revenge on Adam for embarrassing her in front of her  boyfriend, Jake. Working with Chase, she puts on a cyber cloak that  makes her look and sound exactly like Principal Perry and embarrasses  Adam in front of the whole school. However, when she shows Adam the  cyber cloak right before the dance that night, it glitches and won't  come off. Bree then makes Chase wear a cyber cloak of herself and go to  the dance with Jake. While that's going on, Leo and Douglas snoop in  Donald's briefcase and compete for what they think is to be his new  vice-president, only to find out it was for the Davenport Industries  softball team. Donald then finds out that he had two cyber cloaks  missing and deactivates them. This embarrasses Chase and gets Bree into  trouble with Jake. She then thinks she's patched things up with Jake,  but it's really Principal Perry wearing a cyber cloak.

Face Off

During Christmas, when the Lab Rats discover that their new action figures are being outsold by another toy, The Nerble,  they attempt to improve their toys by adding special features. After  adding them they decide that the toys are too dangerous for kids and put  them in a box to be destroyed. Tasha is running a toy drive at the  school and is collecting gifts. She finds the action figures and hands  them out. When the Lab Rats find out, they rush to school and try to  catch the action figures. After destroying the toy drive, they find a  way to make it up to Tasha and the kids. Leo and Donald have a snowball  fight in the house and Grandma Rose shows up just as Leo uses his bionic  arm. Rose gets mad and calls Donald a bad father. Donald tries to makes  it up to Rose by giving her a Bree action figure, but it promptly  explodes.

Merry Glitchmas

The Lab Rats plan to gain good publicity by having cameramen film them  during a mission, but it turns into a disaster when they fight for  screen time. After the mission, the president orders the team to stay  away from the public in order to let him settle things down. However, it  goes wrong when Leo and Principal Perry are holding back angry  protesters who want the Lab Rats gone, and Leo accidentally uses his  bionic arm. As the protesters become even more enraged, they try to  storm the house; Adam panics and uses his bionic super breath to blow  everyone off the premises. However, Chase criticizes Adam's actions and  the Lab Rats start fighting. They eventually decide to break the team.  Three weeks later, the Lab Rats refuse to talk to each other, but they  are forced into action when Krane plans to use his Triton App on  everyone in the world. A large battle ensues, pitting Leo, Donald,  Douglas, and the Lab Rats against Krane and his bionic army. Most of the  soldiers attack Adam and Bree, who manage to take them out. Chase has a  one-on-one battle with S-3 and Leo has one-on-one battle against S-1.  Donald and Douglas attack the soldiers surrounding the satellite, but  Krane keeps them from getting too close. Eventually, the Lab Rats and  the rest of the team manage to hold back many of the soldiers, but they  are running out of time to stop Krane. Douglas then reveals that the Lab  Rats can fuse their abilities to stop Krane. They succeed, blasting  Krane into the sky and breaking his control over the soldiers. However,  their victory is cut short when they find out that Donald is in serious  condition after the battle. Later they find out that after the surgery,  Donald is still in a very delicate condition. Leo is made an official  member of the Lab Rats and gets an upgrade to his bionic arm.

Rise of the Secret Soldiers (1)

Rise of the Secret Soldiers (2)

Donald is in critical condition after the battle with Krane and his  soldiers; Leo visits him in the hospital and in an attempt to save him,  he risks his life to perform a dangerous bionic process, accelerating  his aging process, thus turning him into an old man. Meanwhile, after  being deactivated from the Triton App, Krane’s former bionic soldiers  have nowhere to go and follow Adam home. The Lab Rats try to protect  them because they aren't evil anymore. However, the president doesn't  get this and tries to have them arrested, but changes his mind when the  soldiers use their powers to heal and save Leo who almost died of old  age. Right when they are going to be taken into custody, a newly healed  Donald strikes up a deal with the president to build an academy for the  soldiers.

Bionic House Party

Leo finds out that he will be a student at the bionic academy, not a  mentor like Adam, Bree and Chase. Chase engages in a battle against a  former nemesis and Adam mentors a younger student.

First Day of Bionic Academy

Donald leaves the Lab Rats in charge of the bionic academy while he  celebrates his anniversary with Tasha. Leo invites Janelle to the  island, but gets distracted by his nemesis, Spin. Spin challenges Leo to  a bionic battle. Meanwhile, Adam tells Bob to do all the things he  can't do when Donald is around. Bob goes ahead and steals Donald's  plane, but he then hits a button that deactivates the auto-pilot.  Sebastian and the Lab Rats work together to save Bob. Back at the bionic  battle, Leo tries to impress Janelle by battling with Spin. Spin gets  the first attack and knocks Leo over. Leo then fights back and hits Spin  in the leg. Janelle rushes over to Spin, who is crying, and helps him  up. Janelle gets upset at Leo and takes Spin to get a smoothie. It is  then revealed that Spin faked the injury so Janelle would spend time  with him. Leo tries to prove that Spin is faking it by taking his  crutches. Janelle then yells at Leo and carries Spin away. Leo tries  again by filming Spin admitting faking the injury, but Spin then smashes  Leo's tablet. Janelle walks in and yells at Leo and Spin. Leo and Spin  then become her servants and they must give her the vacation that she  deserves. Later, Adam uses Donald's jet wing to fly up to the jet and  save Bob. When Adam tries re-activating the auto-pilot, the plane begins  to fall. Adam helps Bob conquer his fear of heights by jumping out of  the jet. Bob takes Adam's parachute and Adam jumps out to try to get it  from Bob. At Donald's house, just as Donald finishes setting up the  table, Adam and Bob fall through the ceiling. Donald is disappointed  with the Lab Rats. Adam confesses and tells him that he wasn't a good  mentor. Bob tells Donald that Adam was a good mentor by boosting his  confidence. Donald then tells him that his plane was a smart plane that  even without the auto-pilot the plane would land itself automatically.

Adam Steps Up

When Leo is chosen for a mission over Spin, Spin recruits Bob to join  him on an unauthorized mission to prove themselves. They both end up  stuck in quicksand and call Leo to save them. After Leo rescues them,  Donald decides to move Leo up a color. Meanwhile, Principal Perry  returns saying that she wants a job as head of security at the academy.  After countless attempts, Donald agrees, leaving Leo in a particular  despair. Meanwhile, Sebastian tries to help Chase get revenge on Adam  with a virtual reality machine. After that, Chase tells him about his  creator and how they took him out. Later, Sebastian injures Donald with  the machine used to prank Adam. When the Lab Rats take Donald to the  medic, Sebastian turns evil and says that if they took away his father,  then he is going to take away theirs.

Unauthorized Mission

Leo is an ordinary teenager who has moved into a high-tech "smart'' house with his mother, inventor stepfather and Eddy, the computer that runs the house. Leo's life becomes less ordinary when, one day, he discovers a secret underground lab that houses three experiments: superhuman teenagers. The trio -- Adam, the strong one, Bree, the fast one and Chase, the smart one -- convinces Leo and his parents to let them leave their lab and join Leo at school, where they try to fit in while having to manage their unpredictable bionic strengths. As Leo figures out a way to keep his new pals' bionic abilities a secret, they help him build self-confidence.

Which Father Knows Best?

Seasons4

Season 3 Episodes26

Cast5

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