"Adventures Across Time and Dimension"
From the back of the book:
"GURPS Time Travel is the complete guide to dimension-hopping adventure. [...] Now GURPS players can tie all their campaigns together ... adventuring across time, or in parallel universes, to visit every GURPS worldbook ever published."
"With this book, the GURPS system reaches its full potential for universal adventure. Any time, any place, any universe, any genre. Anything can happen!"