- 3000000 BC
- Tuesday, October 10: Doc, Jules, and Verne arrive from 1991 to test the Proprietary Ultrasonic Subatomic Molecular Redistributor. They run into Biff Tannen, a Tyrannosaurus Rex ancestor. However, they escape with the help of a Pteranodon (who Verne names "Donnie"). They stop the meteor they would have destroyed the dinosaurs and escape to 1991. This creates Timeline 50, which begins at Doc, Jules, and Verne's entry point in 1991 and timeline 49 fades away.
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