Redking is a dinosaur-like monster originally featured in the 1966 tokusatsu television series, Ultraman. Its first appearance was in Episode #8, "The Lawless Monster Zone." As the series progressed it has developed to sometimes be a weaker and more commical monster
Subtitle: Skull Monster (どくろ怪獣 - Dokuro Kaijū)
Red King at Ultraman Wiki.