The Sea of a Mysterious Light

is the twenty-first episode of Ultraman Gaia.
==Plot==
A new threat that condenses oxygen appears under the sea, and XIG’s Team Marlin heads underneath the waves to deal with the threat.
==Cast==
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===Guest Actors===
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==Appearances==
===Ultras===
*Ultraman Gaia
**Version 1
===Kaiju===
*Candea
===Mecha===
*Government/Military
**Peace Carry (x1)
**Siren 7500 (x1)
==Home Media==
*Ultraman Gaia Volume 6 features episodes 21-24.
A018b821ed_061007_450.jpg
==Trivia==
*The episode gets its name from the light in the ocean that Candea makes.
*This is the first appearance of Team Marlin.
Category:Episodes
Category:Ultraman Gaia Episodes
Category:Ultraman Gaia