From the Back of the Book:
The Dark Lands, ruled by Bob, Lord of Evil, is a silly place where you can play light-hearted adventures with a techno-fantasy-horror theme. This book can be used with any existing system of rules - you're not required to generate a new Character to visit the Land of Bob, as Characters from other worlds can easily be brought to the Dark Lands via a crashed spaceship, magical backfire, or interdimensional teleportation gate. Characters could even suffer an individual or collective bout of unconsciousness and visit Tir Nan Bob in their dreams, er... nightmares!
What's inside? Everything you need to start Adventuring!