If there's any franchise that's perfectly set up to explore time travel, it's "Star Trek." These episodes are top-rated by fans and had the biggest impact.

Time travel is one of the hallmarks of science fiction, but many time-travel-based movies have plots that leave one with a headache just thinking about them. What if you could travel into the past, ...

Time travel has long been a subject of fascination in science fiction, but recent scientific endeavors suggest that it might not be as far-fetched as once thought. Researchers in laboratories around ...

This month marks 40 years since Michael J. Fox, as Marty McFly, jumped into a souped-up DeLorean and went back in time, putting his very future existence at risk. (SOUNDBITE OF FILM, "BACK TO THE ...