Overman has previously written eight episodes of Merlin, as well as episodes of Hotel Babylon, New Tricks and Hustle.
Capps told SFX: “Episode 3 is written by Howard Overman. Howard is an extraordinary writer because he can totally switch from Misfits to Merlin to naturalistic drama. He’s one of the few writers I know who can switch genres so easily.”
He also confirmed that Series 4 will open with a two-part story: “It’s being written by Julian Jones, who wrote the Series 3 opening two-parter and the season finale. Alice Troughton, who directed ‘Eye Of The Phoenix’, will be directing it.”
Capps also announced that Series 4 will now run for 13 episodes.