[s2e12] War Of The Worlds: Pt. 1 -

Ben, Gwen, and Kevin realize they can't do this alone. They recruit a "who's who" of allies from past episodes, including the Plumber's Kids and even their former enemy, Darkstar .

The survivors realize that the "aliens" are actually future humans who have traveled back in time to harvest organs to fix their own decaying DNA. [S2E12] War of the Worlds: Pt. 1

Bill Ward is forced to flee after his plan to use a biological weapon against the invaders makes him a target. We see the moral weight of his actions as he deals with the consequences of infecting Emily with a virus designed to kill the aliens. Ben, Gwen, and Kevin realize they can't do this alone

In this modern, gritty adaptation, "Episode 12" refers to the fourth episode of Season 2 (as the show has 8-episode seasons). Bill Ward is forced to flee after his

Azmuth drops a bombshell about the Omnitrix —it wasn't just built for combat, but as a "Noah’s Ark" to preserve and restore extinct species.