Generator Rex - Season 3 Episode 4 -
Heroes United (2)
A one hour crossover episode between Ben 10: Ultimate Alien and Generator Rex in which Ben Tennyson accidentally travels to Rex Salazar's dimension. After quarrels with each other, the two finally work together to stop a threat once created by Rex's brother, Caesar, the Alpha Nanite (Michael Emerson).
Please explain the problem in a few words.
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Max 255 characters.