Series 2

Series 2 of Merlin premiered on Saturday 19th September 2009.

Episodes
The Curse of Cornelius Sigan - 19 September 2009

The Once and Future Queen - 26 September 2009

The Nightmare Begins - 3 October 2009

Lancelot and Guinevere - 10 October 2009

Beauty and the Beast: Part One - 24 October 2009

Beauty and the Beast: Part Two - 31 October 2009

The Witchfinder - 7 November 2009

The Sins of the Father - 14 November 2009

The Lady of the Lake - 21 November 2009

Title TBA - 28 November 2009

Title TBA - 5 December 2009

Title TBA - 12 December 2009

Title TBA - 19 December 2009

Series 2
The show was renewed for a second series following the airing of Le Morte d'Arthur by Ben Stephenson, Controller of BBC Drama Commissioning and BBC One Controller Jay Hunt, which began filming in early 2009. It will see the return of Colin Morgan, Bradley James, Anthony Head, Richard Wilson and the rest of the cast.

Merlin will continue to try and keep the truth about his magic from everyone. Morgana will be relying more on Gwen and Merlin for support in order to keep her own secret. Arthur and Gwen's relationship will develop further and they will encounter several barriers due to their different stations and class.

There has already been speculation by the fans over what will happen in the new series. Following the cliffhanger ending in Le Morte d'Arthur many believe that The Great Dragon will play a large role, possibly as a villain.

In the next series old characters return and dark secrets come to Camelot.

Synopsis
Merlin must continue in his destiny to protect Camelot and the young Prince Arthur using his special gift: magic. But King Uther has banned the practice of sorcery and Merlin must keep his talents secret on pain of death.

As many dangers threaten the mythic city, Arthur must show great courage and skill in order to defend the kingdom, with Merlin at his side.

Gaius, the court physician, continues to provide Merlin with help and guidance. Gwen is as ever a stalwart friend to Merlin, helping where she can in his adventures with Arthur.

Meanwhile, Morgana, the king's ward, is increasingly troubled by her dreams. And the Great Dragon remains beneath the castle, paying close attention to the adventures of our young wizard. Lancolot returns.

Main cast

 * Colin Morgan as Merlin
 * Bradley James as Prince Arthur
 * Richard Wilson as Gaius
 * Anthony Head as Uther Pendragon
 * Angel Coulby as Gwen
 * Katie McGrath as Morgana
 * John Hurt as The Great Dragon

Recurring Cast

 * Asa Butterfield as Mordred
 * Michael Cronin as Geoffrey of Monmouth
 * Rupert Young as Sir Leon

Guest stars

 * Mackenzie Crook as Cedric/Cornelius Sigan (Episode 2.1: The Curse of Cornelius Sigan)
 * Adrian Lester as Myror
 * Colin Salmon as Aglain
 * James Cosmo as Hengist
 * Santiago Cabrera as Lancelot
 * Charles Dance as Aredian
 * Sarah Parish as Lady Catrina

Mackenzie Crook guest-starred in the opening episode as the creepy Cedric, who is determined to muscle in on Merlin's position as Arthur's right-hand-man – much to Merlin's frustration.

Sarah Parish will play a disgusting troll masquerading as the beautiful Lady Catrina; Adrian Lester is the devious Myror; Charles Dance will guest-star as Aredian, the sinister Witchfinder; and Santiago Cabrera returns as the dashing Lancelot.

Further guest stars will be announced at a later date.