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The English subtitled version of Ben 10: Generator Rex - Heroes United makes the content accessible to a broader audience, including deaf and hard-of-hearing viewers. The subtitles provide a written representation of the dialogue, making it easier for viewers to follow the story.
"Ultimate Humungousaur? No, I think I'll go with… Ultimate Echo Echo!" Subtitle matches verbatim.
It sounds like you're looking for information about the for the crossover special "Ben 10/Generator Rex: Heroes United."