2021 is a common year starting on Friday in the Gregorian calendar, and is the current year.
- Date Unknown: A great trash storm occurred when many people dropped trash from their flying cars. As Dr. Emmett Brown traveled back in time to prevent the invention of the hoverboard, which was the catalyst for the invention of hover-converted cars, it's unlikely the great trash storm occurred in the new timeline.
Behind the scenes
- Sunday, January 10: The book Build It With Some Style : Unauthorized Tales of the Time Machines from Back to the Future by Tom Silknitter is released.
- Wednesday, March 17: The third issue of IDW's The Transformers/Back to the Future, crossover miniseries is released.
- Wednesday, June 9: The fourth issue of IDW's The Transformers/Back to the Future, crossover miniseries is released.
- Tuesday, September 14: Back to the Future: The Animated Series celebrates its 30th anniversary
- COVID-19, also known as coronavirus, continues to cause a global pandemic.
- Doc Brown Saves the World (First mentioned)