Brian discovers that he can use Stewie's time machine to pick up girls, but when he tries to cover his tracks he accidentally reverses the flow of time.
When Peter and the guys try to salvage a sunken Mercedes-Benz, Peter half-heartedly promises a favor to a helpful dolphin (guest voice Ricky Gervais). Soon the dolphin moves to Quahog, outstays his welcome at Peter's and moves into Cleveland's house across the street. Peter tries to reunite the dolphin with his ex-wife in hopes that he'll return to the ocean, but his plan backfires and the whole dolphin family moves into Cleveland's.
After a car accident, Peter, Brian, Joe, and Quagmire wake up in a hospital with no memory and discover that they're the last people left on Earth.
After Peter's favorite children's television show gets cancelled, he takes matters into his own hands by creating and starring in his own show for kids. Meanwhile, Meg begins an internship at the hospital with Dr. Hartman.
Stewie meets a little girl who might be his soulmate; Lois buys twin beds after Peter repeatedly crushes her in his sleep.
With the Brown family moving back to Quahog, it looks like the old gang is reunited. But Peter's friendship with Cleveland is quickly put on hold when Donna and Lois butt heads over different parenting styles, and forbid them to see each other.
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