After Stewie catches Brian plagiarizing his Twitter account for his standup act after Brians own material bombs, he breaks off their friendship and instead builds a robot companion named Lyle so he'll have someone his own equal to spend time with, only for the robot to begin growing intellectually after than him.
At the same time, Lois decides to buy a new mattress for the bed after discovering just how badly their old one has deteriorated over the years, especially on Peters side, but when the cost of the new mattress makes Lois unwilling to have sex on it, Peter embarks on a quest to get their old mattress back.
Tropes:
- Actor Allusion: Carl does an impression of Bob Belcher from Bob's Burgers and Archer from Archer. All three characters are voiced by H. Jon Benjamin.
- Deliberate Values Dissonance: Invoked during a Cutaway Gag, in which Peter, Cleveland, and Joe are declared insane by a 1950s era doctor for things that were a sign of mental instability at the time (Peter being friends with a handicapped man and a Black man, Cleveland for talking back to a White man, and Joe just for being handicapped).
- Gone Horribly Right: Stewie designed Lyle to develop intellectually so he'd keep up with Stewie and grow as a person, only for Lyle to develop much faster than a human and quickly outgrow him.
- Non Sequitur, *Thud*: When Peter drunkenly prepares for sleep, he mumbles, "We act like we don't take a lot from The Simpsons, but we took a lot from The Simpsons."
- Take That!: One of the friend activities Stewie brings Lyle to is a movie, because in his words "friends watch movies together and then talk about them afterwards". Cut to them exiting the theater in complete silence, including the entire busride home, after having sat through The Monuments Men.
- Too Clever by Half: Stewie invents robots that can think and learn, not realising they would eventually surpass him and also gain uglier human qualities from being intellectual superiors. Despite Stewie's insistence that their intellect should make them unstoppable, by the time Brian steps in, their pretentious qualities have taken over their programming so much that he very easily defeats them by squirting water on them.
- Totem Pole Trench: What Stewie and Lyle do at the amusement park
- What Measure Is a Non-Human?: Stewie's robots are destroyed just for being jerks, despite being completely sentient.
- Weaksauce Weakness: Despite their intelligence, the robots aren't waterproof, and Brian destroys them this way.
- Wrongfully Committed: A Cutaway Gag has Peter and his friends visiting a fifties-era insane asylum. A doctor who works there proceeds to have them committed for things that would've been unacceptable at the time. For instance, Peter is committed for being friends with a minority and a crippled man. When Cleveland protests, he's declared insane for speaking up to a white man. Finally, Joe is committed and scheduled for euthanasia as he's crippled.
