Time Travelers

"So there I was, minding my own business when this crazy old codger with a cane showed up. He says he's my distant relative. I didn't see any resemblance. So he says, "How would you like to be rich?" So I say, "Sure." So he lays this book on me. He says this book'll tell me the outcome of every sporting event 'till the end of this century. All I have to do is bet on a winner, and I'll never lose. So I say, "What's the catch?" He says, "No catch, just keep it a secret." After that he disappeared. I never saw him again. Oh, and he told me one other thing. He said someday, a crazy wild-eyed scientist or a kid may show up asking about that book. And if that ever happens... [laughs as he pulls out his gun] Funny, I never thought it would be you."

- Alternate Biff Tannen before to try to kill Marty McFly.

Time Travelers are characters who who can (more or less) freely travel between certain points in time, analogous to movement between different points in space, typically using a hypothetical device known as a time machine, in the form of a vehicle or of a portal connecting distant points in time. But it can also happen that a character was inherently born with such power.

Distinct from Time Travel because, although Time is considered the "fourth dimension", time travellers otherwise remain in the same plane while hopping between its different time periods.

Examples

 * Terminator (800 Series, Model 101): A cyborg of a post-apocalyptic future who travelled to the past in order to erase John Connor from existing by terminating his mother Sarah.
 * Time Eater: A cosmic entity controlled by Dr. Eggman for undo all his previous losses.