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 threa…