Johnny Knoxville sends Steve-O, Chris Pontius, and new Jackass cast members on a Shark Week mission for the ages. They'll dial up a series of shark stunts that test their bravery and threshold of pain as they put common shark myths to the test. After Johnny Knoxville sent the guys on a terrifying Shark Week mission last year, Knoxville is joining the boys as they head out to get Poopies over his fear of sharks.