Ben 10/Generator: Rex: Heroes United is a crossover special between Ben 10: Ultimate Alien and Generator Rex. The crossover was written by Man of Action and aired on November 25, 2011 on Cartoon Network.
Voice Cast
- Daryl Sabara - Rex
- Yuri Lowenthal - Ben Tennyson
- Wally Kurth - Agent Six
- Grey DeLisle - Dr. Holiday
- John DiMaggio - Bobo Haha
- J.K. Simmons - White Knight
- Michael Emerson - Nanite Alpha
- Jennifer Hale - Black Knight
- Freddy Rodriguez - Caesar
Additional Voices
- Dee Bradley Baker - Big Chill, Diamondhead, Four Arms, Humungousaur, Lodestar, Upchuck, Additional Voices
- Grey DeLisle - Diane Farrah, Mom, Additional Voices
- John DiMaggio - Rath
- David Kaye - Shocksquatch
- Yuri Lowenthal - Upgrade