#1
S4E16
Homecoming
The vision reappears to Mimmi and Zac, this time speaking to them. Weilan learns a new detail about the dragon legend that suggests Nerissa is alive.
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The peaks and the valleys. Find the essential episodes — and the ones to skip.
#2
S4E15
The Legend of Jiao Long
A priceless artifact recovered by a deep-sea treasure hunter provides a clue as to how the mermaids can defeat the water dragon.
#3
S1E26
Decision Time
Cam apologizes to Zac for his betrayal but keeps the trident hidden. The girls look forward to returning to the pod. Everyone catches on to Cam's scheme and races to Mako Island. Will they stop Cam and be allowed to return to the pod?
#4
The Chosen One
S3E13
#5
Betrayed
S1E25
#6
Reunion
S2E13
#7
A New Man
S3E1
#8
A Visit from the East
S4E1
#9
Zac's Pool Party
S1E7
#10
The Siren
S1E9
Lowlights
Sirena, Lyla and Nixie have the task of keeping trespassers off the magical island. On a full moon, they fail to stop a land boy, Zac, from falling into the sacred Moon Pool, and the power of the moon transforms him into a merman.
#67
The Job
S3E7
#66
Nowhere to Hide
S1E20
#65
Mopping Up
S4E4
#64
Stormy Seas
S2E6
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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