Baby Stewie
Stewie builds a DNA-altering machine that will allow him to remain smart forever, but the invention has the adverse effect and he instead transforms into what he should have always been - an actual baby.
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More from this season
S18 E1
Yacht Rocky
When the brewery announces it will be firing one employee, Peter is nervous he will be the one let go; the family departs on a Yacht Rock cruise that doesn't go as expected.
S18 E2
Bri-Da
Peter and his friends are sick of forgetting the million-dollar business ideas they come up with while drinking, so they strap on Joe's police body cams to record their every move. Meanwhile, Quagmire is trying to come to terms with an unexpected family development.
S18 E3
Absolutely Babulous
When Stewie receives a participation medal in his school's toddler games, he begins to question everything he has ever won. Meanwhile, Peter causes a fight between Lois' parents and must repair the damage he caused.
S18 E4
Disney's The Reboot
The network decides that it's time to explore some unique ways to reboot the series. When three versions of the reboots are shown to a focus group, the feedback takes some surprising turns.