Mort Goldman accidentally steps into Stewie's time machine and goes back in time and Brian and Stewie follow to retrieve him. When they discover that they've ended up in 1939 Poland, Stewie, Brian and Mort must make a perilous journey to Nazi Germany to find their way back to the present.
Stewie: All right, Brian, we'll go. But don't touch anything while we're there. Even stepping on a mosquito can cause a chain reaction that drastically alters the present.
Stewie: Nah. You can do whatever you want.
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Hitler: These filth are making a mockery of our Reich! Execute them! [the solders cock their guns, ready to shoot them, but Hitler interrupts them] Unless...
Brian: Unless what?
Hitler: Unless they can sing a charming musical number.
[Stewie and Brian smile at each other as music starts playing. A pair of hats and canes are tossed at them]
Stewie & Brian: Whenever-
Mort: [stands on the return pad] Damn it, will you two just get in the fucking time machine?!
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