Board Thread:Suggestions/@comment-24770490-20140510094838/@comment-34326521-20140510113237

Superbike10 wrote: Blaziken rjcf wrote: The "Heroes United" special was non-canon, as far as any of us know, so it shouldn't be under "Ultimate Alien", as it infers it was part of the series, rather than just aired during it. As for putting it in bold, that would be against the MoS. It's not a movie, nor is it an actual episode. It's a crossover. There is nothing that contradicts Heroes united with the series.

It was never mentioned in either series (Ben 10 and Generator Rex). Alpha, at the speed he was breaking out of his own sphere, would have been free by now, built (or turned into) a Null Void Generator, escaped, and gone after Ben and/or Rex.