Series 4

Series 4 of Merlin will air in autumn 2011. Its air date is not yet known. The series was originally cut to ten episodes from the previous series' 13 due to financial issues. It was deemed better to reduce the length of the series and maintain the quality rather than staying with 13 episodes but having to reduce the budget and therefor the quality for each. However, Johnny Capps revealed on the 18th of March 2011 that the show has been increased to its original 13 episodes, opening with a two-parter. Filming started in mid-March 2011. Block 1 at Pierrefonds finished May 20th and the cast and crew should return to France for Block 2, starting June 20th and continuing until June 27th.

Rumours

 * Nathaniel Parker will play Arthur's uncle, Agravaine. This has been confirmed.
 * Arthur will become either King or Regent King. Uther is broken, so he takes a bit more control.
 * Morgause will return. This has been confirmed.
 * Freya will return. This is likely as producers have said Merlin and Freya will grow closer, and they only spoke for a short time in Series 3.
 * Morgana will return. This has been confirmed.
 * Mordred will return.
 * Excalibur will make an appearance.
 * Gwaine will learn sorcery.
 * Morgana kills Uther.
 * Gwen and Arthur will get married.
 * Merlin will show a darker side to his personality.
 * Morgana will meet the Great Dragon.
 * Merlin is badly injured and Arthur defies Leon to save him.
 * Merlin will disguise as an old man again.
 * The Isle of the Blessed will reappear.
 * Huge changes for Merlin.
 * Gwen has been looking after the King during the year gap between Series 3 and 4.
 * Nimueh will return. Her profile on the BBC implies this.
 * Morgause killed Gaius.
 * Somebody is going to be burnt at the stake.
 * The tension between Gwen and Morgana increases considerably.
 * Arthur's loyalties will be tested to the limit.
 * Elena will return.
 * Lancelot will be declared dead.
 * Arthur will learn the truth of his birth again and that magic can be used for good as well as evil.
 * Merlin will reveal his powers.
 * Snape kills Dumbledore

Trivia

 * Entertainers arrive in Camelot.
 * Phil Davis is a guest star.
 * Anthony Head finished filming Series 4 on the 3rd May, much earlier than the rest of the cast
 * Morgana has a scene in the lower town.
 * James Callis will put in an appearance.
 * Andrew Fowler gonna play Knight Camelotu.