|Home world:||Planet Earth (U40 Timeline)|
|First appearance:||The☆Ultraman Episode 5 "The Passenger! Break through the Underground"|
|Affiliation:||Tough Gillas (Mate)|
Tough Gillaco (offspring)
Subtitle: Underground Monster (地底怪獣 Chitei Kaijū?)
- Height: 118 m
- Weight: 96,000 t
- Location: Africa
Tough Gillan is a giant reptile that lived in Africa. Then one day the Science Defense Guard heard news that Tough Gillan has been eating a immense amount of trees. Dr. Henry Nishiki told S.D.G. that this event of tree storage has happened before signifying the start of the Gillan mating season.
Then Tough Gillan meet with his mate that lived in the Japan Alps and this causes a disturbance to the people living around Gillan and Gillas so S.D.G. tried to drag away the mates away. TBA
Powers and Abilities
- Burrowing: Tough Gillan can burrow at high speeds while underground.
- Neck Quills: Tough Gillan is armed with quills on the back of her neck. These quills can also be launched at foes.
- Extraordinary Jumper: Tough Gillan can jump far into the air.
- Spiked Tail: Tough Gillan can use her tail to bash and flip foes high into the air.
|The☆Ultraman Kaiju & Seijin|
|Seagra | Spiral | Wanigodon | Red Smogy | Tough Gillan | Tough Gillas | Tough Gillaco | Firebadon | Combugon | Robot No.101 | Alien Baltan IV | Mikonos | Dolfiego | Xalome | Hectore | Liquid Monster | Opt | Garadoras | Xyclon | Gellon | Gadon | Goglan | King Moa | Badan | Islanda | Gerada | Janyur | Bedoran | Bader Group | Bagon | Janyur III | Zaanmoth | Zanba | Dragodos | Death Balan | Gibaaroga | Red King | Aboras | Banila | Earthtron | Ghostron | Gokinezula | Alien Baladon | Dabaran | Jadan | Jagon | Skeldon | Garbados | Megasaura | Babilar | Gamiba | Imedo Being | Goadarion | Jinario | Groteng | Plazoon | Agujon | Deathpower | Zuma | Gurol | Darantulas | Alien Noa | Heller | Roygar | Panther | Heller Army | Gumons | Hell Cat | Orolan | Gilos | Gilo | Fake Ultraman Joneus | Hatari | Large Battleship | Dostony | Spader | Caperadon | Alien Scien | Golding | Gedon | Hella Umaya | Heller Fleet | Makdatar|