[s9e12] The Hand That Rocks The Wheelchair -

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: At a local park, Stewie's ray gun misfires when he tries to seek revenge on a bully. Feeling that he has "lost his edge" as a brilliant, evil baby, he builds a neural-enhancement machine to restore his malice.

: Brian and Stewie set a trap to lure the clone. The two Stewies fight and lose their clothes, leaving Brian unable to tell them apart. Brian tests them by telling them to look at their feet; the real Stewie giggles because he finds feet funny. Brian shoots the other one. [S9E12] The Hand That Rocks the Wheelchair

: Lois pawns the caretaking duties off on Meg. Because Joe is genuinely kind to her and doesn't mind being seen with her, Meg quickly becomes infatuated and misreads his politeness as romantic interest.

: "Evil Stewie" is an unstoppable, violent force. He attacks Brian (cutting off his tail), beats up the real Stewie, and goes on a killing spree in Quahog—even luring the Kool-Aid Man to a violent death. : Brian and Stewie set a trap to lure the clone

: The split of Stewie into a docile side and a purely evil side heavily mimics the classic Star Trek episode "The Enemy Within" , complete with the original dramatic score.

: The final freeze-frame shot with Stewie turning to the camera with yellow monster eyes is a direct reference to the end of the legendary "Thriller" music video. Brian shoots the other one

: Instead of enhancing him, the machine extracts all of Stewie's residual evil and concentrates it into an aggressive, physical clone with inverted clothing colors.