During the battle against the massive fungal entity known as the Mycelium, the glitches due to the fungal spores and accidentally unlocks a new alien form for Ben: Wildvine .

While driving through a mountain pass, Grandpa Max narrowly avoids hitting a frantic boy named Gilbert who is fleeing from his summer camp, . The boy is terrified and has a strange, fungal rash on his arm. Deciding to help, the Tennyson trio drives Gilbert back to the camp, only to find the mess hall in shambles and the site seemingly abandoned in a hurry—even though the food is still warm. The Fungal Threat

With the fungus defeated and the campers rescued, the group leaves the "Camp of Fear" behind, though Ben and Gwen's birthday rivalry remains as heated as ever. "Ben 10" Camp Fear (TV Episode 2006) - IMDb

: As a plant-based alien, Wildvine can stretch his limbs, grow vines, and merge with other plant life, which proves essential for navigating the overgrown camp.