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.

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.

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.

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

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.

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.

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.

When the Eagles and Ravens start getting too friendly, the headmaster sends them on a grueling two-day hike devised to reignite their competitive fire

The fallout from the hike reverberates inside and outside the school, leading to hard questions -- and a difficult decision.

Brooke scrambles to keep a secret from Alex during an upheaval at the Greenhouse. Sophie's past choices threaten her current status at the school.

As a sinister plot targeting the school unfolds, Hayley embraces her new lifestyle, annoying Leo, while Brooke argues with Alex about her brother.

A remarkable gift from Ryan boosts the Ravens' flagging spirits. Becca smothers Leo with attention. Brooke makes an impulsive, ill-timed decision.

Members of the Eagles and Ravens team up on a risky mission to find a valuable chunk of magnetite. A disheartened Brooke looks to make a fresh start.

While the Eagles and Ravens compete in a capture-the-flag challenge, Enzo receives a mysterious offer that's too lucrative for him to question.

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

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.

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

Trusted with personal information, Becca and Daniel each battle their true emotions. A schedule change poses a serious problem for a shadowy enemy.

The shadowy enemy puts a sinister plan in motion. Later, Sophie investigates questionable news while Daniel debates making a confession.

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

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?