Ben 10/Generator Rex: Heroes United Two Heroes. One Epic Battle. Ben Tennyson falls through a wormhole and encounters Rex. The two heroes must unite against a foe that can absorb their powers. Details Casts Galleries Posters Title Ben 10/Generator Rex: Heroes United Release Date 2011-11-25 Runtime 00 Hours 46 Minutes Genres Action Animation Production Companies Cartoon Network Studios, Man of Action Entertainment Production Countries United States of America Daryl Sabara... Rex... Yuri Lowenthal... Ben Tennyson... Original Size (1920x1080) Original Size (1280x720) Original Size (848x1281) Original Size (1032x1448)