The Mysterious Monster Island

is the eighteenth episode of The☆Ultraman.
==Plot==
Yuriko's expression changes upon learning that a monster has appeared on her hometown's South Ukigo Island. In fact, Yuriko had been sending her father deceptive letters, falsely claiming that she was actively serving in the Science Guard Party.
==Cast==
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===Guest Actors===
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==Appearances==
===Ultras===
*Ultraman Joneus
===Kaiju===
*Islanda