Emmett Brown, Professor Marcus Irving, and Marty McFly arrived from September 29, 1997 to April 15, 1986.Timeline 27 was a timeline created when Dr.
- Tuesday, April 15: Marty, Doc, and Irving arrive from September 29, 1997. They encounter Marty robots and Irving. A past version of Irving saves them, inadvertently erasing the future version of Marcus from existence.
- Saturday, May 10: Joey Baines gets paroled after being in prison since 1972 after robbing Sarah Ellsworth. Marty looks up his uncle by talking to his fellow siblings, his parents, his girlfriend's mother and Doc. Doc warns Marty not to communicate with Joey. Marty and Jennifer learn that Joey was arrested 13 years, 10 months, and 16 days prior. Irving takes Marty to June 23, 1972. This creates Timeline 28, which begins at Irving and Marty's entry point at June 23, 1972 and timeline 27 fades away.
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