For their first challenge, the Eagles and Ravens compete to solve a riddle. To be accepted by his team, Alex distances himself from his older sister.

Hayley and Daniel attempt to dehypnotize Brooke. Max and Jackie start to see a common thread behind all the strange events surrounding Emma.

Brooke tells Daniel and Hayley the last things she can remember before being hypnotized. Marcus makes a decision that stuns Louis and infuriates Judy.

As time runs out on a bomb designed to destroy the cave and the rest of the Greenhouse, the students in the gym must get past police to make a rescue.

At the school's Harvest Fair, the Eagles and the Ravens compete to see which team can raise more scholarship money by marketing and selling cupcakes.

Leo awakens in the cave. During dinner with their parents, Brooke and Daniel carry out a plan to get Emma's white knight chess pieces from Jason.

While Daniel and Alex stall for time at the basketball game, Hayley sneaks into the cave and Max gets help from an unexpected ally.

After catching his mom in lie, Daniel compares notes with Hayley. Aspen makes a slip that shocks Leo. Jackie is tricked into confessing a past misdeed.

Sophie finds herself shunned by all the Eagles -- except for one. Daniel gets a hunch as to who might be influencing Brooke's recent behavior.

Eight months after the sudden loss of his astronaut mom, Alex undergoes rigorous entrance testing to attend the same leadership high school she did.

During a quiz game, know-it-all Aspen grates on Hayley's nerves and Brooke suffers a strange lapse in memory. Max misses Emma and tries calling her.

Under the sea, Hayley experiences something that changes how she thinks about her mom. Believing the world is ending, Parker blurts out a confession.

When Hayley tells her brother and friends the big news, they argue over whether to take action. Max and Jackie are caught trying to contact Emma.

Flashbacks reveal a discovery that teenage Ryan made at the Greenhouse and an order given shortly before the Athena launch. Brooke is led into a trap.

After an explosion rocks the school, one student hopes for a rescue while another one faces a threat from a mysterious virus.

As Hayley considers a risky way to save her classmate, the Eagles and the Ravens have a theory about the mystery virus.

When Aspen's jealousy gets the better of her, Leo tells her they need to talk. Judy and Marcus trigger a test quake and get unexpected results.

Leo's setback creates tension between Hayley and Daniel. Meanwhile, an FBI investigation results in several major revelations.

As Hayley, Daniel and Leo edge closer to learning the truth behind the mystery virus, their real feelings about each other finally come out.

Time is ticking as the shadowy figure makes a frightening ultimatum. Can the Eagles and the Ravens intervene in time to save the world?

Hayley's determination to get to the bottom of an annoying beeping noise unwittingly sets a deadly chain of events into motion.

As the Eagles and the Ravens examine evidence from an attack, a suspicious text from Leo leads them all to a shocking discovery.

The Eagles pressure Alex to help them get revenge against the Ravens. FBI agents look for a weapon lost near campus and suspect a student took it.

Brooke spots boyfriend Daniel doing something suspicious on the beach. Jackie gets to know Max's sweet side when he helps her with an assignment.

Jackie coaches Max in asking Emma out on a date. Jason receives an important but risky mission he must carry out at the satellite launch.