Ben Tennyson falls through a wormhole and encounters Rex. The two heroes must unite against a foe that can absorb their powers.
Keywords:
Fight
Extraterrestrial technology
Transformation
Cartoon
Teen superhero
Tv special
Crossover
Ben 10
Movie tag line: "Two Heroes. One Epic Battle."
Character: Rex Salazar (voice)
Character: Ben Tennyson/Upgrade (voice)
Character: Agent Six (voice)
Character: Dr. Holiday (voice)
Character: Bobo Haha/Rath (voice)