Merlin : Season 4 - (Complete)

Series 4 of Merlin will air in autumn 2011. Its air date is confirmed to be 1 October 2011 for the UK. It will air at 7.50 p.m. on BBC One. The series was originally cut to ten episodes from the previous series' 13 due to financial issues. However, Johnny Capps revealed on 18 March 2011 that the show has been increased to its original 13 weekly episodes, opening with a two-parter. Filming started in mid-March 2011 in Cardiff, Wales and Pierrefonds, France . This season is said to be darker and more mature than the rest, with the other three having a few violent scenes, and this one having much more. Most characters will show a darker side to their personality. The offical tagline for the fourth series is: The Darkest Hour Is Just Before The Dawn. At the SDCC Merlin Panel, it was confirmed that due to the show's increasing popularity, a fifth season has been comissioned by the BBC, and is likely to air the same time next year.

Episode 01 : Oct 1st 2011
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.

Hellish creatures pour forth, killing all who succumb to their touch. With Uther a shadow of his former self, it falls to Arthur and his loyal knights, including Lancelot, to protect the kingdom.

But it will take more than just swords to vanquish their enemy and Merlin is shocked to the core when he discovers the only way to restore the equilibrium requires a sacrifice of unimaginable proportions...