Tory and Kari use accelerometers and state-of-the-art eye-tracking equipment to determine the best place seat on a roller coaster. Their laboratory is Hades 360 in Wisconsin, the only wooden coaster that has a corkscrew.

Kari and Tory make their way to Southern California's Six Flags Magic Mountain to see just how long they can survive on the thrill ride known as Apocalypse.