Board Thread:Questions and Answers/@comment-11255996-20130810134404/@comment-25396661-20140917215055

Mostlymad hatter wrote: i thought it happened part way though season 3 - thats what ive heard but i cant remember where i got that info ( they realy should say on the dvd's where the movies fit :/ ) The real world reason for why its hard to place when it took place is because when this movie started being made, alien force was still in its first 2 seasons, but it wasn't finished until part way through season 3, so they didn't know that kevin was going to be mutated.

But it can't be during season 3 because kevin isn't mutated, and it can't be after season 3 because ben has the omnitrix. I doubt it was during season 1 or 2 because there is no mention of the highbreed, and in the novel version of this movie it says ben and gwen just turned 16. So thats why I say it must be in between season 2 and 3.