Though cousins, Ben and Gwen share the same birthday, but not amicably. In the midst of squabbling over it, Grandpa Max almost hits a desperate kid on a mountain roadway. Taking him back to Camp Opinicon, they find his summer camp deserted sans for a pair of young twins named Andy and Mandy. Soon it becomes apparent that life on Earth is in danger of being devoured by a horde of aggressive fungi, and the Omnitrix turns Ben into a twelfth alien. Written by
Did You Know?
Introduction of Wildvine as Ben's 12th alien. See more
You're not going anywhere.
Did you hear that?
I communicate with all vegetation on a telepathic level.