Harry Harrison does it again for the third time with The Stainless Steel Rat Saves the World.
A romp if there has ever been one, 'Slippery' Jim DiGriz is sent back in time to the future to stop a time-war from happening.
An adventure into paradox, Harrison has a blast with time puns and his ever charismatic character.
Please for the love of God if you want an old comedic sci-fi series (not Hitchikers) pick these up at your local used bookstore, you'll thank yourself.