Ep 19. Once Upon a Future King

Arthur of Camelot, who is an evil man, and his sorceress friend Mab are sent back in time by Merlin. Together they start to take over in the time of Hercules, but want to go back to their own time, so they decide to hunt down Merlin who is now a young man just learning magic. Hercules runs into Merlin and protects him from Arthur and his sword Excalibur. Soon Arthur realizes what he is doing is wrong and decides to help Hercules, Morrigan, and Merlin in the fight against Mab.