Ben 10: Alien Force, Season 3

Past Gwen #1:
(conversation continues)...Are you sure?

Past Gwen #2:
You will never forgive yourself if you let this happen.

Gwen:
Don't listen to her! I'm from her future and she doesn't know what she's talking about!

Past Gwen #2:
Oh come on! How do I know you're not an impostor?

Gwen:
Ugh, the lock on our locker is broken, we just leave it hanging there so it looks closed...

Past Gwen #2:
Alright, you're me, but I still think we should save Kevin.

Past Gwen #1:
You guys need to make up our mind!

Gwen:
Already done. Paradox was right! We have to let it happen the way it did the first time.

Past Gwen #2:
We can't keep Kevin from mutating?

Gwen:
No... we can't, (puts hand on Past Gwen 1's forehead and wipes memory) and just to make sure she doesn't try—i'll make her forget everything that happened... (turns her around and walks off with Past Gwen #2) Come on...(walks off) we don't belong here...