From the back of the book:
"IT HAS FINALLY HAPPENED-the phenomenon most dreaded and feared by all Time Corps agents and sane beings everywhere!
A Time Storm ravages the Continuum, mixing a temporal stew of Chicago gangsters, Union soldiers, cartoon maniacs, great Caesars, talking dinosaurs, displaced wizards, and horrors too startling to print! When these amazing forces collide-when creatures worlds apart crash through the wall of time together-only the hardiest agents survive.
Timestorm is a campaign of six incredible adventures, based on the advanced rules in the Timetricks game supplement. These adventures are so tumultuous, so wild, and so deadly that we recommend you don't use regular Time Corps agents. Instead, Timestorm features eight ready-to-play heroes from the Corps' infamous "Last Resort Division": Hercules, Sergeant Striker, Cleopatra, Agatha Marple, Merlin, Robin Hood, Amelia Earhart, and Boudicca, a Celtic warrior queen. (Of course, if you think your own characters are up to the challenge, we dare you to try! The best can survive.)"