The Sheriff of Nottingham arrests Morty Butterman, a confidence trickster, who happens to be Robin's double. The Sheriff lures Robin to a sporting event, and then replace him with Morty to discredit Robin's reputation. To get Robin out of the way, the Sheriff transports him back in time, to inhabit the body of an ancestor of Robin's, who betrayed a British queen. When Morty takes Robin's place he discovers what it is like to be a true hero. He disobeys the Sheriff and maintains Robin's character. Meanwhile, Robin rescues the queen and returns to his own time. Morty intercepts an arrow meant for Robin and dies a hero, saving his life. (thetvdb.com)