Dinosaurs were reptiles that lived on Earth between 231 and 66 million years ago.
In 1955, Biff Tannen stowed away in the DeLorean time machine. When it returned to 1991, he stole it from the Institute of Future Technology. While Doc is locked in the lab, he recruits volunteers to travel through time in an 8-passenger DeLorean to chase Biff through time and bring both DeLorean time machines back to 1991. While being chased through time, Biff travels into an active volcano during a time period populated by dinosaurs.
Dinosaurs were also seen several times by the Browns on their trips to the past in 1991 and 1992, including a tyrannosaurus rex and a pteranodon while visiting the Cretaceous Period. In one alternate timeline, dinosaurs resembled their human counterparts due to continued evolution after Emmett Brown prevented an asteroid impact. Doc and Marty McFly subsequently encountered a Tannensaurus during this time. The following year, Verne brought the egg of an unidentified species of dinosaur back from the past. Hatched in 1992, the baby dinosaur, whom they nicknamed "Tiny", wreaked havoc before it was returned to the prehistoric era from whence it came.
On October 21, 2015, Biff Tannen stole the DeLorean time machine. He couldn't figure out how to make it travel through time, so he hit the display of the time circuits with his cane. He is sent into the past, during a time when the land that would be Hill Valley is under the ocean, and dinosaurs roam the Earth. He encounters a velociraptor, which steals the Blast from the Past bag containing the Grays Sports Almanac. Biff hits the raptor in the head with his cane, retrieves the bag, and travels forward in time to November 12, 1955.
- Back to the Future: The Ride
- Back to the Future: The Animated Series
- Back to the Future (Harvey Comics)
- Back to the Future: The Game
- Back to the Future: The Game - Episode 4: Double Visions (dinosaur model at the Hill Valley of the Past exhibit)
- Back to the Future: Untold Tales and Alternate Timelines 3