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. He travels to San Francisco, only to find that the man is him from the future. The DVD contains commentaries and a sneak peek preview of the American Dad! Volume 1 DVD. It was 20th Century Fox's first direct-to-video animated film since 1999's Bartok the Magnificent.

Fox eventually aired the film as three separate episodes for the Family Guy season 4 finale on May 21, 2006. Fox had several scenes cut out and other scenes altered to bring the length down to 66 minutes. The shortened and separated versions of the three segments – "Stewie B. Goode" (written by Gary Janetti and Chris Sheridan), "Bango Was His Name, Oh!" (written by Alex Borstein), and "Stu and Stewie's Excellent Adventure" (written by Steve Callaghan) – were aired on May 21, 2006.