S10E5: Back to the Pilot
BRIAN: Wait! STEWIE: Wait!
Who the devil are you? We're from the future.
So are we. We're from the further future.
- We came to stop you.
What they did actually turns out to be damage-free.
It's what you're about to do, stopping them, that causes utter bedlam.
Oh, come on.
Wait! Stop! We're from the further-further future.
What you guys do eventually works out.