When Perry's nasty niece Kerry comes to the island school for a stay, things start getting destroyed. Kerry's the prime suspect, but bionic evidence leads Chase to believe not all of Sebastian's rebels were rounded up.
A remnant of Victor Krane's evil comes to the island academy in the form of Douglas' long-lost bionic dog Otis, bringing allergies to Chase, obedience to Adam, and a mission to kill.
Adam and Chase each lead their own student groups against each other in a series of simulated exercises that will evaluate both student and mentor performances.
For fun on a day off, Douglas and Chase bring a long-extinct prehistoric sea-spider back to life, which soon puts one Academy member's life in immediate danger and imperils the rest.
Bree and Chase discover that a female bionic student has a commando app like Chase. After she starts terrorizing the academy, they activate Spike to subdue her.
Douglas reveals that a former colleague is a movie director who wants to make a movie based on Adam, Bree, and Chase; when the director shows up to the academy with her actor, Troy West, for research, her evil agenda begins to unfold.
Having won an initial battle against Giselle and Troy, the bionic team scrambles to find the abducted Chase before Giselle has time to cut him open for his bionic chip.
S-1's return makes the team aware of a doomsday virus embedded in Krane's ex-soldiers that leaves all bionic teens with only ten hours to live before exploding as human bombs.
Chase and Donald create a new, groundbreaking energy source and unveil it to the world. Meanwhile, Kaz and Oliver infiltrate the academy in hopes of Kaz finally obtaining powers.
While trying to prove his worth before his bionic step-siblings, Leo permanently injures a teammate, all because the U.S. President overlooked him for an upcoming team award.
The academy students begin to vanish after receiving an operating system upgrade. The Davenport group puts their lives at risk when they face off against the vanished students' captors - a nefarious duo they recognize from their past.
