Stego (Voiced by Ray Kahnert) is a member of the Dinosaucers.
He is not particularly intelligent, but does not present the same degree of stupidity as Bonehead. He is good natured and innocent. Though he tries to be brave, he normally acts cowardly and is prone to panic. However, he can overcome this and comes to the rescue of his friends when needed.
He is a Stegosaurus, a herbivorous dinosaur that lived at the end of the Jurassic Period, about 150 million years ago. Apparently inherent to Stego is that, like his ancestors, he does not possess a remarkable intellect.
Stego has a tremendous potential for defense and can even coil or curl himself inside his uniform, much like a turtle is often depicted as going into their shells. Like Bonehead, he spends most of his time in Lavadome helping to monitor Tyranno activity. However, Allo enlists him on missions quite a few more times than his even more dim-witted comrade.
In addition to defence, Stego does not seem to realize his own strength. Of the Dinosaucers, Stego is actually one of the physically strongest, though second behind Bronto Thunder. Stego's friendliness and cowardly nature prevents him from using much overt violence, however.
He can dinovolve into a 30 foot or 9 meters long Stegosaurus, whose caudal thagomizers can pierce through most materials and whose sheer weight can crush or damage anything from common cars to Tyranno ships. His dorsal plates and spikes also make it difficult to strike him from above or from behind.
Stego's spaceship's color resembles the color of his scales. It has plates on the top of the hull, making it resemble a Stegosaurus.