Stella was a Stegosaurus Kaiju who appeared in the 3rd Episode of Dinosaur Great War Izenborg, and like Gorgo and Terrano, it use animals as its slave army for its assault, in it case Rats. It's known abilities were burrowing through the ground, eye beams and Hypnosis via Vibrating its Dorsal Spikes, which helped it direct its slave Army. It was mostly Blue in color with a yellow bottom, with its hide covered in warts.

When hunting a Rat that ate Ai's jacket at the laundry, a girl named Miyuki and two Workers stumble upon Stella in an unseen cavern next to the sewers; it takes control of a horde of Rats, who swarm the two workers to death and nearly killed the small girl; she is later found by Ai and in her state mumbles about the Red Mice. After taking her to her Brother (Masao), she then informs the others, who conclude this a new Dinosaur attack and Deploy. Using a Sound Wave detector, they learn the Horde is traveling underground towards the Seventh Oil Refinery.

The IzenGo arrives as The Rats attack, but they use Freezer Beams on some of them, just as Stella emerges from the ground to fight; the Rats attacks the Refinery, nodding the Oil Pipe lines and power lines, causing explosions. IzenTwo is sent to deal with the fire while IzenOne deals with the Dinosaur; easier said than done, as the Fire Ranges out control, due to the large amount of rats causing then destruction and Ai's and Zen's fighting due to a disagreement doesn't allowed them Synchronize at the most important time; Masao, arrives wanting to help (after seeing the events unfolding on television), but is fire upon by Stella who tries to trample him, but is distracted by the Siblings, who save Masao and is carried away by the IzenTwo.

Having dealt with their differences, the Sibling Synchronize into Izenman and take the fight onto Stella at full power; Barra recommends to destroy the Spikes, which Izenborg thus by using Folding Cutter, this leads to the destruction of the Rats who en masse run towards the fire, dealing with that problem – Izenborg then rams through Stella with the Izen Driller; the Beast leaves out one last Roar before exploding. The Team then returns to base.