Time travel is the ability or action of an individual or object departing the timeline and re-entering it at another moment, essentially traveling through time forward into the future or backward into the past. The means by which this can occur are numerous, but typically through the use of magic, a cosmic event or a scientific device that somehow opens a stable pathway allowing a passage through the time stream.

A related subject is the concept of alternate or parallel timelines, quantum realities that have diverged from our timeline and still exist in the multiverse. In "The Twilight Zone," a few individuals have encountered words almost wholly identical to their own except for trivial or monumental details.

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