Ben Tennyson accidentally travels through a dimensional rift into Rex Salazar’s world. After an initial misunderstanding and battle, the two heroes team up to stop
The story of Ben and Rex didn't end with the credits. A comic book sequel titled was released on November 30, 2011 , as issue #65 of DC Comics' Cartoon Network Action Pack . The plot flips the premise: Rex and Bobo travel to Ben's universe to hunt for a rare element called Promethium. The comic serves as a direct follow-up, showing Rex interacting with Ben's world and meeting his supporting cast, like Kevin and Gwen. Ten years later, a second crossover, "Ben Gen 10," aired in April 2021, featuring younger versions of the characters in a new adventure.
The most immediate challenge the creators faced was aesthetic. Ben 10 had evolved from the youthful, rounded designs of the original series into the sharper, edgier look of Ultimate Alien . Conversely, Generator Rex was defined by a unique, angular "Man of Action" style that felt more akin to a comic book come to life.
The movie merged these sonic landscapes. The track accompanying the final battle, where Ben and Rex combine their energies ben 10 generator rex heroes united movie
They eventually discover the true enemy: , a sentient mass of nanites. Created by Rex's brother, Caesar, Alpha has developed a terrifying intelligence and a desire to absorb all nanites—including the ultimate prize, the Omega Nanite inside Rex.
Rex uses his standard Nanite builds to match Ben's alien raw power: to match Humungousaur's strength. Boogie Pack for aerial dogfights with Big Chill. Slam Cannon for heavy artillery. The Ultimate Fusion
: For Ben, this takes place during Ultimate Alien after "Ben 10,000 Returns." For Rex, it is set during the third season of his series. Production & Reception Ben Tennyson accidentally travels through a dimensional rift
The setup was simple but effective: a mysterious rift drops Ben Tennyson into Rex Salazar’s gritty, Nanite-infested Manhattan.
| Character | Voice Actor | Notable Character | | :--- | :--- | :--- | | | Yuri Lowenthal | Spider-Man ( Marvel's Spider-Man ) | | Rex Salazar | Daryl Sabara | Juni Cortez ( Spy Kids ) | | Nanite Alpha (Villain) | Michael Emerson | Benjamin Linus ( Lost ) | | Bobo Haha / Rath | John DiMaggio | Bender ( Futurama ), Jake ( Adventure Time ) | | White Knight | J.K. Simmons | J. Jonah Jameson ( Spider-Man ) | | Agent Six | Wally Kurth | Justin Kiriakis ( Days of Our Lives ) | | Humungousaur / Alien Forms | Dee Bradley Baker | Clone Troopers ( Star Wars ) |
The Ultimate Crossover: Ben 10 & Generator Rex: Heroes United The plot flips the premise: Rex and Bobo
Even years later, this special remains the gold standard for how to do a crossover right. Here’s why this hour-long event still holds up as a masterpiece of action animation. When Worlds Collide
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Ben 10/Generator Rex: Heroes United is not just "good for a crossover." It is genuinely one of the best stories told in either franchise. It respects the lore of both worlds, delivers incredible action, and leaves you wishing for a sequel that, sadly, will never come.