"WatchMojo" Top 10 TV Crossovers (TV Episode 2015)
The crossover between "Generator Rex" & "Ben 10: Ultimate Alien" gets an honorable mention."WatchMojo" Top 10 Best Cartoon Crossovers (TV Episode 2018)
"Ben 10/Generator Rex: Heroes United" is #8."WatchMojo" Top 20 Greatest TV Crossovers of All Time (TV Episode 2020)
"Ben 10/Generator Rex: Heroes United" is #20."MsMojo" Top 10 Greatest Cartoon Network Crossovers (TV Episode 2020)
"Ben 10/Generator Rex: Heroes United" is #2."WatchMojo" Top 20 Epic Fight Scenes in Animated Superhero TV Shows (TV Episode 2021)
Ben Tennyson & Rex Salazar vs. the Alpha Nanite is #5.
Ben 10 (TV Series 2005–2008)
Rex tells Six he needs a theme song, then proceeds to sing a theme he's thought of. The song is a parody of original Ben 10 series opening reworded for Rex. And when he's singing the theme song, the music is playing in the background.Ben 10: Ultimate Alien (TV Series 2010–2012)
Rex meets Ben Tennyson from "Ultimate Alien".
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