Merlin is a British fantasy television program consisting of 4 seasons and 52 episodes about the Arthurian legends of the wizard Merlin and his relationship with Prince Arthur. The main cast includes Colin Morgan as Merlin, Bradley James as Arthur, Katie McGrath as Morgana, and Richard Wilson as Gaius. Each season contains 13 episodes between 47 to 52 minutes in length. The program uses magical language and is set in medieval times to bring the Arthurian legends to life for a family audience.