Professor McMoo, Pat and Bo aren't just any old cows, they're time-travelling, super-clever Cows In Action who visit past and future, around the world to stop the evil Ter-moo-nators changing history . . .
The gang are told that the F.B.I. are working on a deadly joke that will be so funny it could wipe out their enemies, so they set off to find jokes so funny they will counteract this threat! The time shed revisits the sites of their CIA adventures so far - including Ancient Egypt, the Roman Empire and The Wild West - to find their jokes as well as some landings in brand-new places.