There are 52 episodes Merlin season 1, season 2, season 3 and season 4. Merlin season 1 episode list: Season 1, Episode 1 - The Dragon's Call Season 1, Episode 2 - Valiant Season 1, Episode 3 - The Mark of Nimueh Season 1, Episode 4 - The Poisoned Chalice Season 1, Episode 5 - Lancelot Season 1, Episode 6 - A Remedy to Cure All Ills Season 1, Episode 7 - The ...