Animated Character Database
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300px-Ken Tennyson

In his only appearance, he was abducted by DNAliens in Santa Mira after they sabotaged his ride, the "Awesomemobile" in order to flush Max Tennyson out of hiding, as he was slowing down their operations on Earth.

Ken's failure to regularly contact his parents led to his disappearance coming to the attention of his younger sister, Gwen, and cousin, Ben Tennyson. After being traced to his last known location, Ken's trail was first followed by his Grandpa Max, who tracked him down to a DNAlien Hatchery. Ken, having previously known nothing about his grandfather's former life as a Plumber, was questioned by a DNAlien for any information, but Ken knowing nothing, the DNAlien, having already known that Ken knew nothing, placed a Xenocyte on Ken's face, which began to convert him into a DNAlien.

When Max infiltrated the Hatchery to free Ken, Ken was already partially converted into a DNAlien and attacked his own grandfather for the Highbreed. When Ben, Gwen, and Kevin infiltrated the Hatchery having followed Max's trail, they were ambushed by a swarm of DNAliens, Ken among them. When Gwen saw her brother almost completely changed into a DNAlien, she restrained him and prevented him from being attacked by Ben and Kevin—they having not recognized him yet.

At Ben's confirmation, Ben and the Omnitrix together restored Ken to his human form. Alongside the others, Ken aided them in rescuing Max, who revealed that he'd been keeping up-to-date with all of their experiences since his disappearance. While Max went to shut down the Hatchery, Ken helped the others destroy the DNAliens shipment of Xenocyte eggs.

When Max seemingly sacrificed himself to bring down the Highbreed in charge of the operation with a makeshift Null Void grenade, Ken was present at his grandfather's apparent death.

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