Rich Man, Poor Man
S04E06 Petarded
Following his victory in Trivial Pursuit, Peter feels he's a genius. To challenge this belief, Brian encourages him to take the MacArthur Genius Grant test. The results, however, reveal that Peter is actually mentally challenged. He initially enjoys exploiting this newfound status, but things take a turn when Lois gets hurt, leading to the kids being taken away due to Peter’s inability to care for them responsibly.
Season 4 Episodes
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North by North Quahog
Fast Times at Buddy Cianci Jr. High
Blind Ambition
Don't Make Me Over
The Cleveland–Loretta Quagmire
Petarded
Brian the Bachelor
8 Simple Rules for Buying My Teenage Daughter
Breaking Out Is Hard to Do
Model Misbehavior
Peter's Got Woods
Perfect Castaway
Jungle Love
PTV
Brian Goes Back to College
The Courtship of Stewie's Father
The Fat Guy Strangler
The Father, the Son, and the Holy Fonz
Brian Sings and Swings
Patriot Games
I Take Thee Quagmire
Sibling Rivalry
Deep Throats
Peterotica
You May Now Kiss the... Uh... Guy Who Receives
Petergeist
The Griffin Family History
Stewie B. Goode
Bango Was His Name Oh!
Stu & Stewie's Excellent Adventure