You can find this crossover special on the following platforms, which typically offer English Closed Captioning (CC) or subtitles:
A: No. The movie works as a standalone. However, subtitles help if you don't know who characters like Six or Bobo Haha are. Ben 10 Generator Rex Heroes United English Subtitles
The crossover marks the first appearance of the alien Shocksquatch . You can find this crossover special on the
It sounds like you're looking for information about the for the crossover special "Ben 10/Generator Rex: Heroes United." Ben 10 Generator Rex Heroes United English Subtitles
Based on analysis of 5 popular fan-made SRT files (from OpenSubtitles.org and Subscene):