S10E5: Back to the Pilot
I mean, you could make life better for yourself.
And not just for yourself, for everyone. You could stop 9/11.
Brian, there's one rule of time travel, and that is,
do not alter the past in any way or the consequences could be dire.
Yeah, where'd you hear that? Quantum Leap.
That guy changed the past all the time!
Quick, Brian! Get down!