Plot: Team Tennyson enjoys the biggest convention in town, but when a gawky costume store employee finds a familiar-looking helmet in the back of the store and tries it on, Ben is faced with the return of an old foe in a new form: Forever Knight.

Ben 10 - Season 4 - Cosplay Day (Episode 14)
Episode Aired On:
Sunday, March 15 2020
4 years ago
Sunday, March 15 2020
4 years ago