Board Thread:General Discussion/@comment-5210173-20130725170743

was heroes united something cannon? read somewhere here in this wiki that one of the producers said it's not but I don't remenber who he was

also this page says is non canon

http://ben10.answers.wikia.com/wiki/Is_Ben_10-Generator_Rex:_Heroes_United_cnon_or_non_canon_in_the_Ben_10_world 