1970 is a year in the 20th century and first year of the 1970s.
Event
- Timeline 1
- Friday, December 25: The McFly family celebrates Christmas.
- Timeline 2
- Friday, December 25: After an elderly Biff Tannen made himself rich by traveling back to 1955 to give his younger self a Grays Sports Almanac, his younger self became a millionaire by gambling as he knew the results before they happened. He used his wealth to send Lorraine Baines McFly a box of toys for her children, Dave, Linda, and Marty, every Christmas. After the seventh year straight of receiving presents from Biff, George McFly states that it needs to stop. Lorraine wants to leave Hill Valley, but George convinces her to let the family stay as he doesn't want to take the children away from their grandparents.
Behind the scenes
- Date Unknown: Adam Harrington (Matches) is born in San Francisco, California
- Monday, October 12: Kirk Cameron (host of The Secrets of the Back to the Future Trilogy) is born.
Real world
- April 22: Earth Day is celebrated for the first time.
Appearance
- The Earth Day Special (Non-canonical appearance)(Mentioned only)
- Back to the Future: Biff to the Future
