First start off with "Back to the Future" which is the story of Marty Mcfly (Michael J. Fox) who's your average teenager as his mentor Professor Doc Brown (Christopher Lloyd) helps him with an experiment involving time traveling using a time-machine vehicle which uses plutonium that he stole from Libyians as Brown gets killed. Marty travels back in time so he can save his life as he's in the year 1955, his future mother (Lea Thompson) and future father (Crispin Glover) are teens that didn't know each other in high school for Marty creates some serious time damage even with his presence such as his future mom falling for him instead of his future dad, only Doc Brown of the past can help him repair the damage and return back to 1985.

"Back to the Future 2" is set after the day when Marty arrived back from the past, Doc has warned Marty and his girlfriend (Elizabeth Shue) that their future children will be in danger in the future and they must go to the future to fix the problem. However after the assignment in the world of tommorow, future Biff (Thomas Wilson) stowsaway on the Deloren back to 1955 to give his younger self a stolen futuristic almanac that has all the sport events and statistics. His younger self soon makes a bet that makes him a future success, Marty must repair the time and space damage by going back to 1955 to find & destroy the book.

Finally "Back to the Future 3" has Marty spending time at 1955's Doc Brown's house for the night as the future self of Doc settles down in the year 1885. He decides to go back in time to save his mentor from being dead in the past, however Biff's anchester Mad-Dog is causing big trouble in town and Doc has fallen for a teacher named Clair (Mary Steenburgen) but can Marty save Doc from danger or will history be erased?