Episode Ratings Grid

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Episode Power Rankings

The peaks and the valleys. Find the essential episodes — and the ones to skip.

#1
S3E13 9.2
The Coming of Arthur: Part Two

Will Arthur be able to save Camelot from the evil Morgana? Morgana, newly crowned as Queen of Camelot, begins a reign of terrible evil over the innocent citizens of the kingdom. Counting on Morgause and her immortal army at her command all hope seems lost for Uther, who is forced to witness how his kingdom crumble under the unimaginable cruelty of his own daughter. Meanwhile, on the outskirts of Camelot, Arthur recovers his strength and plans a counter attack with the help of a few loyals at his side: Gwaine, Lancelot, Elyan and Percival. However, Merlin is aware that not even a skilful warrior like Arthur can defeat an immortal foe without magic. Will he be able to reclaim the great sword Excalibur from the Lake of Avalon in time to save the lives of those he cares the most about?

#2
S2E13 9.0
The Last Dragonlord

The Great Dragon is finally free. Full of rage, he attacks Camelot with pitiless intensity. The castle is crumbling and Arthur's men cannot hold out much longer but only a Dragonlord can kill a dragon and Uther wiped them all out years ago. Or did he? Gaius admits one such man could still be alive and in hiding.

#3
S4E13 8.9
The Sword in the Stone: Part Two

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 army closing in, their situation becomes desperate. Arthur must take control before Camelot is lost forever… But faced with Agravaine’s betrayal and the strength of Morgana’s force, the young King has lost his conviction. Only Merlin can restore his faith, and only an extraordinary act can prove to the King that he was born to rule. Will the young warlock convince Arthur before his dreams of Albion fall to pieces?

#4 The Diamond of the Day: Part One S5E12 8.9
#5 The Darkest Hour: Part Two S4E2 8.8
#6 The Fires of Idirsholas S2E12 8.6
#7 The Eye of the Phoenix S3E8 8.6
#8 The Coming of Arthur: Part One S3E12 8.6
#9 The Darkest Hour S4E1 8.6
#10 The Sword in the Stone: Part One S4E12 8.6

Lowlights

#65 S4E8 Lamia 7.2

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 sour. Far from home and with no-one to trust, Merlin becomes embroiled in a deadly game of cat and mouse. No longer sure who is the hunter and who is the hunted, can the young warlock survive long enough to uncover the truth?

#64 Love in the Time of Dragons S3E9 7.3
#63 The Changeling S3E6 7.4
#62 The Gates of Avalon S1E7 7.4
#61 Beauty and the Beast S2E5 7.5

The Quality Arc

Each point is an episode, plotted in order. Colored bands mark season boundaries. Look for the rise, the plateau, or the decline.

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Episode Engagement

High votes + high rating = beloved classic. High votes + low rating = notorious stinker. Low votes + high rating = hidden gem.

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Series Trajectory

One point per season. Smooths out the episode-to-episode noise to reveal the bigger arc.

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Season Momentum

Did each season build or fizzle? Green means the finale outscored the premiere. Red means the opposite. Longer arrows, bigger swings.

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Season Consistency

How steady is each season? Tightly clustered dots mean reliable quality. Scattered dots mean a wild ride.

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