Time travel is, without a doubt, one of the most popular concepts in the iconic series and is the focus of some of the show's all-time best episodes, including season 4, episode 10, "No Time Like ...

Classics like Back to the Future, Bill and Ted's Excellent Adventure, and Looper are all among the best and most essential time travel movies.

The best episodes of the classic sci-fi series that involve time travel include "Walking Distance" and "Once Upon a Time." ...