Trivia: Ben 10/Generator Rex: Heroes United
- Approval of God: Derrick Wyatt, art director for Ben 10: Omniverse, generally holds low opinions of both Ben 10: Ultimate Alien and Generator Rex. Yet he admitted the crossover was "better than expected," calling it "fun."
- Hey, It's That Voice!: All of Ben's aliens (bar Rath and Upgrade) are voiced by Dee Bradley Baker, except for the new guy, Shocksquatch, who's voiced by David Kaye. Alpha is voiced by Michael Emerson.
- Name's the Same: Who else is the original form/version of something, gains sentience, can absorb others to gain power, and has an ultimate form named Alpha Omega?