
Big Man on Hippocampus
When Peter hits his head and suffers amnesia after getting in a fight with Richard Dawson on Family Feud, he forgets everything about his life, including his family and friends. In an attempt to try to bring back his memory, Lois decides to reintroduce Peter to his old self, until he begins to hit on other women, much to Lois's dismay. She decides to take the kids and leave Peter, giving Quagmire the opportunity to score with Lois. Peter now must prove to Lois he can remember her and make himself worthy of her again.
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More from this season

S8 E1
Road to the Multiverse
With the help of an out-of-this-world remote control, Stewie and Brian travel through alternate universes, including a post-apocalyptic world and a parallel world run by dogs where humans are pets.

S8 E2
Family Goy
When Lois finds a lump on her breast, she goes to the doctor to test for cancer. The tests come back benign, but the doctor looks at her family medical history and reveals some news about Lois' heritage.

S8 E3
Spies Reminiscent of Us
Chevy Chase and Dan Aykroyd move to Quahog. Brian and Stewie find out about their secret agency. They are told that there are Russian Sleeper Cells all over US. They go talk to Mayor West, and find out he is one of the sleeper cells. They follow Mayor West to Russia where they disable a nuke aimed at the US.

S8 E4
Brian's Got a Brand New Bag
When Brian begins dating an older woman, the family begins to make fun of him. After Brian's new fling breaks her hip, he gets the pleasure of becoming her errand boy.