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Season guide

Merlin: Season 4

13 episodes Premiered Oct 1, 2011 Updated Oct 1, 2026

Merlin returns for its fourth series, finding Camelot standing on the brink of a golden age as depicted in the official synopsis. However, the birth of this new era will not be an easy one, because the forces of evil are gathering and the darkest hour is just before the dawn. The overarching narrative of the series centers on the unlikely friendship between Merlin, a young man gifted with extraordinary magical powers

Previously on Merlin

Season 4 Lore Primer

Key plot threads, lore context, and character stakes you need to remember before diving into this season.

  • ⚡ Merlin is a young man gifted with extraordinary magical powers.
  • ⚡ Arthur serves as the heir to the crown of Camelot.
  • ⚡ Merlin and Arthur share an unlikely friendship.
  • ⚡ The series is loosely based on Arthurian legends regarding the close relations of Merlin and King Arthur.
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Season overview

Merlin returns for its fourth series, finding Camelot standing on the brink of a golden age as depicted in the official synopsis. However, the birth of this new era will not be an easy one, because the forces of evil are gathering and the darkest hour is just before the dawn. The overarching narrative of the series centers on the unlikely friendship between Merlin, a young man gifted with extraordinary magical powers, and Arthur, the heir to the crown of Camelot. The programme is a British fantasy adventure drama television series loosely based on Arthurian legends regarding the close relations of Merlin and King Arthur. Created by Julian Jones, Jake Michie, Johnny Capps, and Julian Murphy for the BBC, the show explores action, adventure, drama, and sci-fi and fantasy elements. The television programme was broadcast on BBC One for five series.

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Season 4 Episodes

Episode Guide

🛡️ SPOILER SHIELD

Season 4 Progress Shield

Future titles & synopses blurred. Tap "Reveal" on any card to peek.
Binge Efficiency Engine

Season 4: Filler vs. Essential Canon

Filter episodes by narrative weight. Focus on essential mytharc and skip standalone side quests.

38%
62%
Mytharc (5): Crucial lore & season climaxes
Core (8): Character development & subplots
Side Quest (0): Standalone / filler
S4·E1 Mytharc

The Darkest Hour (1)

Oct 1, 2011 · 44 min

Evil sorceress Morgana summons mighty gatekeeper the Cailleach, who opens a door to another world from which hellish creatures pour forth. As Arthur and his loyal knights take up a

S4·E2 Core

The Darkest Hour (2)

Oct 8, 2011 · 43 min

The kingdom is on the brink of collapse and Morgana poised to strike, in the final part of this opening episode of the fantasy drama. As Lancelot races back to Camelot with the dyi

S4·E3 Core

The Wicked Day

Oct 15, 2011 · 44 min

The mighty citadel is buzzing in anticipation of the Prince's birthday celebrations, as the fantasy drama continues. But Arthur's old adversary, Odin, promises to ensure this is on

S4·E4 Core

Aithusa

Oct 22, 2011 · 43 min

A mysterious visitor arrives in Camelot seeking a very special prize: a dragon's egg.

S4·E5 Core

His Father's Son

Oct 29, 2011 · 43 min

Arthur faces his first true test as King when he incurs the wrath of the formidable Queen Annis. With the lives of thousands hanging in the balance, Arthur must find the strength t

S4·E6 Core

A Servant of Two Masters

Nov 5, 2011 · 43 min

Merlin becomes a deadly weapon in Morgana's fight for supremacy when he falls into her hands. By recurring to ancient magic, she manages to turn friend against friend and creates t

S4·E7 Mytharc

The Secret Sharer

Nov 12, 2011 · 43 min

Morgana joins forces with enigmatic wizard Alator to uncover a secret that could change the course of destiny, as the magical drama continues. With allies on both sides of the cast

S4·E8 Core

Lamia

Nov 19, 2011 · 43 min

A mysterious illness draws Merlin to a distant village. But it soon becomes clear that there is more at stake than just his patients' well-being as something sinister turns the air

S4·E9 Mytharc

Lancelot du Lac

Nov 26, 2011 · 45 min

When Sir Lancelot returns from the dead, old feelings reignite, as the drama continues. Gwen must fight temptation before she commits an unspeakable act of betrayal; one that would

S4·E10 Core

A Herald of the New Age

Dec 3, 2011 · 43 min

The Camelot Knights stumble across an eerie shrine deep in the forest, its chilling atmosphere betraying a dark history best left undisturbed, as the magical drama continues. But

S4·E11 Core

The Hunter's Heart

Dec 10, 2011 · 43 min

Morgana ends up discovering a powerful ally in the Southron warlord Helios and they come up with the perfect plan to bring Camelot to its knees. With Arthur preoccupied by the beau

S4·E12 Mytharc

The Sword in the Stone (1)

Dec 17, 2011 · 43 min

Morgana is now the head of a vast Southron army and a deadly net is closing around Camelot. After the sorceress strikes everyone is forced to run for their lives including Arthur.

S4·E13 Mytharc

The Sword in the Stone (2)

Dec 24, 2011 · 44 min

Morgana and Helios have successfully captured Camelot, and Merlin and Arthur are outlaws on the run, in the last episode in this season of Merlin. Trapped in Ealdor with a ruthless

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