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Reija (レイジャ Reija) are supporting monsters that appeared in Ultraman Cosmos 2: The Blue Planet.

Subtitle: Undersea Monster (海底怪獣 Kaitei Kaijū)


Ultraman Cosmos 2: The Blue Planet


Sometime ago, Sandros and his Scorpiss terrorize their planet and turn it into a wasteland. As the Alien Gyashi migrated, Scorpiss chase them and destroy them. When Jin's crew about to be eliminated, Ultraman Justice destroys them and let the remaining Gyashi flew safely. They later made an island base underneath the sea within Earth and even forming a pact with a child Alien Baltan. They also receive aid from Reija, a stingray-like Kaiju for protection.

One day, while Musashi and Mari went snorkeling, they discover a portal underwater and at the same time ambushed by Reija. As Musashi about to follow Mari, he knocked down unconscious. Mari was later taken care by the Alien Gyashi while guided by the Child Baltan. When a Scorpiss attacked a city, Reija appears and fought the monster but only to be overpowered by the menace. Shau appeared and fused with Reija, turned the monster stronger but still, overpowered by Scorpiss. Scorpiss retreated for a while and Reija went back undersea

Two Reija later appeared with both of them fused with Shau and Jin. Though managed to destroy several Scorpiss, but some other appeared and overpowered them until Musashi as Cosmos appeared and destroyed the Scorpiss along with their master, Sandros. As the battle is over, they went back undersea.


Stingray Mode
Reija Stingray.jpg
  • Length: 72 m
  • Weight: 40,000 t
  • Origin: Undersea, Saipan Waters
Powers and Weapons
  • Adept Swimmer: Reija can swim underwater in a moderate speed.
  • Air Adaptation: Despite being an aquatic kaiju, Reija can adapt itself in an aerial atmosphere.
  • Flight: Reija are capable in anti-gravity flight.
  • K2 Radio Waves: The Reijas communicate with each others through transmissions of K2 Radio Waves.

Battle Form (Reija J/Reija S)

Reija S

Reija J

Once merged with an Alien Gyashi, the Reijas became the bipedal Battle Form (戦闘フォーム Sentō Fōmu) to further adept in land and aerial combat. The Community Device (コミュニティ・デバイス Komyuniti Debaisu) on their foreheads shine over whoever it merged with (Shau/red or Jin/bue).

  • Height: 53 m
  • Weight: 59 000 t
  • Origin: Undersea, Saipan Waters
Powers and Weapons
  • Adept Swimmer: Reija can swim underwater in a moderate speed.
  • Flight: Reija are capable in anti-gravity flight.
  • Shockwave Ball: Reija can fire a shockwave ball from their mouth.


Ultraman Cosmos Kaiju
Ultraman Cosmos: The First Contact Alien Baltan (Basical, Shirubyi) | Don Ron | Clevergon
Ultraman Cosmos Chaos Header | Lidorias | Chaos Lidorias | Golmede | Chaos Golmede | Spittle | Igomas | Chaos Bug | Mogrudon | Mienin | Gamoran | Small Inculas | Inculas | Yamawarawa | Geshot | Mudon | Ephemera | Waroga | Galbas | Jelga | Jirak | Chaos Jirak | Ghighi | Renki | Alien Migelon | Angrilla | Bolgils | Parastan | Chaos Parastan | Chaos Parastan S | Gelworm M | Gelworm P | Imitation Ultraman Cosmos | Gragas | Alien Srayu | Guinje | Chaos Header Iblis | Zaranga | Baby Zaranga | Eligal | Chaos Eligal | Chaos Header Mebut | Clevergon | Chaos Clevergon | Golmede Beta | Neldorand | Chaos Neldorand | Reycura | Ragstone | Mahagenom | Taildas | Chaos Taildas | Alien Beryl | Helzzking | Neldorand II | Chaos Neldorand II | Puratea | Exter Raider | Sydevakter | Delgoran | Chaos Delgoran | Sol | Taildas Mechalator | Alien Nowar | Neldorand Mechalator | Ghighi Dr. XX01 | Mugera | Alien Kyulia | GiriBanes | Waroga II | Alukela | Snow Stars | Vadata | Mazalgas | Chaos Mazalgas | Sangelu | Alien Carpcis | Arados | Ragstone Mechalator | Tablis | Mitoru | Gamoran II | Kawanoji | Gruanfan | Giragas | Alt-Helzzking | Dolba | Chaos Dolba | Eligal II | Chaos Eligal II | Chaos Darkness
Ultraman Cosmos 2: The Blue Planet Parastan | Scorpiss | Sandros | Reija | Alien Gyashi | Shirubyi
Ultraman Cosmos vs. Ultraman Justice: The Final Battle Gloker Pawn | Gloker Mother | Mienin | Lidorias | Golmede | Don Ron | Bolgils | Gloker Rook | Gloker Bishop | Alien Gyashi | Shirubyi | Giga Endra | Delacion