Release Message:  To test a new invention called the Sonic Garbage Molecular Redistributor, without Marty, Doc (Dan Castellaneta) and the boys head back to prehistoric times (before 3,000,000 B.C.) so that they will not endanger anyone.

Description:  To test a new invention called the Sonic Garbage Molecular Redistributor, without Marty, Doc and the boys head back to prehistoric times (before 3,000,000 B.C.) so that they will not endanger anyone.Before they can run their test, a Tyrannosaurus gives chase and with the help of a friendly Pteranodon, they escape. At nighttime, they finally set up to run the test. Doc spots a shooting star, which is actually a large meteor, heading toward earth. Doc zaps it with his redistributor and destroys the meteor, thus saving earth, but draining his car battery. Using lemons to power the battery, they head back into the future and civilization as they know it has changed. Odd breeds of dinosaurs rule the earth. Doc realizes that he must return to the past to restore the meteor and in doing so, sentencing their friend, Donny the Pteranodon, into extinction with the rest of the dinosaurs. When the group returns to present-day Hill Valley, while Marty and Einstein are visited again, Verne befriends a little bird that resembles Donny. Issue 2 of the Back to the Future comics is an adaptation of this episode. The title is a parody of the title Back to the Future. The dinosaurs are different than the other four on We're Back! A Dinosaur's Story named Rex, Woog, Dweeb, and Elsa befriending two human children, Louie and Cecilia.