Mako Mermaids S1 E17: Moon Ring 2 (short episode)

When Zac finds a ring on the ocean floor and gives it to Evie, Sirena sees it is a Moon Ring, and the mermaids attempt to recover it before Evie wears it in

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angels captured — S1, Ep: 17: Moon Ring 2 (2013) Mako Mermaids

Mako Mermaids S1 E21: Aquata Returns (short episode)

Mako Mermaids: Moon Ring 2, S1 E17