Stewie is one year old and has a sophisticated attitude. He reached his first birthday in the season 1 episode "Chitty Chitty Death Bang", and has remained the same age ever since. Strangely, he talks to Brian about events that happened 3 years ago, although this can be considered normal in Family Guy given that, for example, in "A Picture Is Worth a 1,000 Bucks" Brian claims he knew Andy Warhol who died in 1987. His nature and mannerisms are juxtaposed with typical childlike interests and actions. While highly literate and able to cite pop culture references that date much further back than his age would let on, he is also entranced by Raffi and the Teletubbies. Stewie succumbs to other weaknesses of children his age — he believes Peter has truly disappeared in a game of Peek-a-Boo, talks to his teddy bear as if he were real, is overcome with laughter when Lois blows on his stomach, and has no idea how to use the toilet. MacFarlane has stated that Stewie is meant to represent the general helplessness of an infant through the eyes of an adult.
Per cartoon physics, his ability to move objects of greater weight than himself is not surprising to other characters, nor is his ability to retrieve firearms from hammerspace.
Stewie's mastery of physics and mechanical engineering are at a level of science fiction. He has constructed advanced fighter-jets, a mind control device, a weather control device, robots, and a time machine. Stewie employs these to cope with the stresses of infant life (such as teething pain, and eating hated broccoli) and to murder his mother Lois, with mixed success at best depending on the objective.
In other episodes, Stewie engages in other violent or criminal acts, including robbery, carjacking, loan sharking, forgery, and killing off many minor characters.
Stewie has been obsessed with his mother's extermination since the beginning of the show, and has commented several times on the subject to other people, such as when he is being interviewed when the family become part of a reality show; "It's not really that I want to kill her... it's just that I don't want her to be alive... any more". His attempts are always fruitless in the end, usually resulting from various unfortunate circumstances getting in the way, such as her opening a cupboard door as he attempts to blow a poison dart at her.
In the Star Wars parody episode "Blue Harvest", Peter imagines Stewie in the role of Darth Vader, which would match his darker personality, although this version of Vader is portrayed as wisecracking and sarcastic. In "The Former Life of Brian", Stewie expresses disappointment at having his face painted as a "kitty-cat", rather than in the likeness of Darth Maul, a Dark Lord of the Sith seen in Star Wars Episode I: The Phantom Menace. Stewie often times seems amused by noticing or creating destruction.
Stewie eventually realizes his dreams of matricide and world domination in the sixth season two-part episode "Stewie Kills Lois" and "Lois Kills Stewie". The events, however, are reverted in a deus ex machina ending, where most of the story turns out to be a computer simulation.
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