Stewie Griffin: The Untold Story is a 2005 American adult animated direct-to-video adventure comedy film set in the Family Guy fictional universe.

Released on September 27, 2005, the film's main plot point concerns Stewie Griffin, following a near-death experience, trying to find who he thinks is his real father after seeing the man on TV.

The shortened and separated versions of the three segments – "Stewie B. Goode" (written by Gary Janetti and Chris Sheridan), "Bango Was His Name, Oh!"

The film opens with its own fictional premiere ceremony, with celebrities such as Drew Barrymore and her date the Kool-Aid Man, the Greased-Up Deaf Guy, the Evil Monkey, David Bowie, and the Griffin family attending.

Two pre-roll advertisements play for fictional films—People Who Look Like They Never Sleep..., starring Susan Sarandon and Vince Vaughn, and The Littlest Bunny, made by Disney and featuring music by Randy Newman—before the film begins.

After Peter learns that the new video store will not let him rent pornography, he vents his frustration in front of newscaster Tom Tucker, who gives him a job at Quahog 5 hosting a segment called "What Really Grinds My Gears", in which he rants about things that bother him.

Knowing Stewie is Peter's son, Tom takes advantage of the situation and presents footage of the accident at the news station.

Stewie is further disappointed when, during a family dinner, he learns Lois is still alive, Meg underwent a sex change shortly after college and is now called Ron, Chris is a police officer married to a foul-mouthed chain-smoking woman called Vanessa whose only interest is sticking Lois and Peter into a retirement home so she can have their house, and that Brian died after eating chocolate out of the garbage and is now in Heaven with Ernest Hemingway, Vincent van Gogh, and Kurt Cobain (who all shot themselves).

Stewie learns he will work at the Quahog Circuit Shack while living with Rupert, his childhood teddy bear, in a filthy apartment.

Disgusted with the way his life will turn out, Stewie remodels Stu's apartment and gets him to lose his virginity to his co-worker, Fran (though he spends more time crying than having sex).

With his life now ruined, Stu laments the day of his near-death experience at the community pool, revealing that, despite Stewie's earlier ascertation that the incident would have no impact on his life, memories of the experience will re-surface when Stewie is 20 years old, causing him to repress most of his major emotions and preventing him from taking any risks.

After saying goodbye to Stu, Stewie travels to the day of the accident (after fulfilling Lois' favor) and prevents himself from getting crushed by the chair.

At the end, Tricia Takanawa talks with the fans and asks them how they liked the film, receiving completely negative feedback.

Lois talks about how she became a prostitute and shows video footage of her trying to beat up a police officer and of her having an argument in a convenience store over her wanting to taste the chips.

The council ordered that Global Television must apologize to its viewers for not warning them about the violence in a scene where Elmer Fudd kills Bugs Bunny with a rifle during a July 23, 2011 airing of the Family Guy episode "Stewie B. Goode".