Fans see Stewie travel back in time and save pooch Brian from being hit by a car, after they previously saw him die from the collision.
The one-year-old goes on a trip to the mall with the Griffin family’s new dog Vinny and tries to bring Brian back by asking Santa for his return, only then remembering his own time machine.
The show's creator Seth MacFarlane took to Twitter after the show to explain the decision to bring back Brian, telling fans they'd "have to be high" if they thought they were going to kill off the character for good.
I mean, you didn't really think we'd kill off Brian, did you? Jesus, we'd have to be fucking high.— Seth MacFarlane (@SethMacFarlane) December 16, 2013
He also said the storyline had a message for viewers: "Never take those you love for granted, for they can be gone in a flash."