Pictures from Merlin Series 4: His Father's Son, A Servant of Two Masters & Lamia ...

The joke goes that the UK only has a handful of actors, and the number of major actors from BBC's Merlin series that have been in Doctor Who proves it's true.

5. The Crystal Cave - Merlin stumbles upon the crystal cave and glimpses a series of terrible prophetic visions.Can he change the future and stop it from happening? And if so, at what price? More info ...

Arthur associates magic with fear, conflict and betrayal, and for Merlin to be connected to that would be a bad idea. However, as the series builds, Merlin is gradually bringing Arthur towards the ...