Merlin: Series 4 Launch Trailer
The BBC has made available an exciting new launch trailer for Series 4 of Merlin.
Merlin faces his toughest challenge yet when Morgana’s blinkered determination threatens not only Arthur’s future, but also the very balance of the world. With her magic stronger than ever, the sorceress summons the mighty Callieach to tear open the veil between the worlds.
Series 4 of Merlin begins early October on BBC1.