1956A was an ABC timeline and a year in the 20th century. The altered timeline it belonged to was created when an elderly Biff Tannen traveled from 2015 to give his younger self from 1955 a sports almanac to make himself rich.
- Biff didn't graduate with the rest of his class, as he was expelled for trying to bribe Vice Principal Stanford S. Strickland the previous year.
- Biff begins pranking Strickland, which gets worse as the years go on.
Alternate timeline of events
For years in this timeline after 1955, see the Hell Valley timeline.
- Date unknown:
- Back to the Future Part II
- Back to the Future: Biff to the Future