Doctor Who may be considered one of the best time travel sci-fi series ever made, but it's not the absolute best, and these ...

Does time move in one direction? Or, as physicist Michio Kaku posited, is it like a river? And can that river "fork into two rivers"? And does that mean, as he suggests, that Albert Einstein's theory ...

Time travel can be a difficult sci-fi concept to pull off, but these cult TV shows do it without tons of plot holes and problems. The nature of time travel makes it equal parts compelling and ...

Time travel TV shows work differently than movies. An ongoing series lets the rules of time travel unfold gradually, telling multiple stories over many seasons instead of having to tell a ...