Merlin Season 2 Episode 1

A treasure chamber is unearthed beneath Camelot,the centre-piece being the shining blue stone in the sarcophagus lid of Cornelius Sigan. Decades earlier Sigan was executed for sorcery and died vowing revenge.Greedy Cedric hears of the treasure and comes to Camelot. Learning that only Merlin and Arthur have keys to the vault he worms his way into the dim young prince's confidence and steals the keys, looting the chamber and stealing the stone. He is consequently possessed by Sigan's spirit, taking on his magic powers and animating gargoyles, which terrorize the city. In return for a promise that one day he will set him free, Merlin acquires extra powers from the Great Dragon and does battle with Cedric, saving Camelot once again. Given what has happened. however, Pendragon is more convinced than before that magic is only evil.