GURPS Time Travel includes:
- A survey of time and dimension travel as presented in fiction – and current scientific thought. Travel by time machine, by dimension gate, even by powers of the mind!
- Six complete campaign backgrounds (and several mini-backgrounds) for travel through time or parallel worlds, or both! Each has its own rules for characters, travel, and paradoxes.
- A detailed discussion of the paradoxes you should consider in creating your own time-travel campaign. Is meddling with history easy? Impossible? Or just a Very Bad Idea?
- Parallel worlds . . . "what if" dimensions where something or everything, is different.
- A timeline of interesting dates in our own world's history . . . as places for time travelers to visit, or as "branch points" for parallel-world campaign.