Mokian (モキアンShinigami.) is the giant alien Kaiju who worked as a servent with
Subtitle: Supermassive Monopole Organism (超巨大単極子生物 Chō Kyodai Tankyoku-ko Seibutsu)
Shinigami, an alien from the galaxy M91 and possibly the creator of Apatee and Algyuros, sent his extremely large and strong Kaiju, Mokian to destroy XIG. Mokian drifted down toward the Earth, threatening to demolish the entire planet. XIG was fast to attack the behemoth, but not even the mighty fire power of the Aerial Base could halt the demon. The thing fought back, wreaking havoc on the base with its energy blasts, eventually causing the base to evacuate most of its personal. Only Gamu and the commander stayed behind, luring the massive creature back into space where they could kill it. Gamu left, leaving the commander to his own as he tried to ram the base itself into the creature.
When the last engine went out, and Gamu saw what he was trying to do, he quickly morphed into Ultraman Gaia, but the creature was far to massive to be destroyed in just one blast. The beast captured Gaia with its tentacles, holding him tight and pumping him with billions of volts of electricity. The commander watched on from the control room as the Aerial Base headed directly into Mokian's gaping maw. Both the Aerial Base and the planet killer were blown apart, the explosion destroying the creature completely as Ultraman Gaia rescued the commander from the inferno.
- Mokian's roar is a reused King of Mons's roar.
- Mokian is named after the Japanese word for "goosefish liver" (アンコウの肝 Ankō no Kimo).
- Length: 333 m
- Weight: 330,000 t
- Origin: M91 Star
- Powers and Weapons
- Levitation: Mokian can levitate or fly for an unlimited amount of time.
- Electric Surge: Mokian can create purple lightning all over his body to shock enemies that get too close.
- Energy Cannons: Mokian has energy cannons on its four "wings".
- Energy Balls: Mokian can launch orange energy balls from his eye.
- Armor: Mokian has armor that can stand up to attacks like Ultraman Gaia's Quantum Stream.
- Electric Tentacles: Mokian can spawn tentacles if its energy cannons are destroyed. They have the ability to send electricity through them and can extend a great distance to catch prey.