|This article is about a/an ally-turned monster in Power Rangers Dino Thunder.|
When Tommy brings in a substitute teacher, while he searches for Zeltrax, he calls in Dr. Morton; a volcanologist. Elsa knowing of his knowledge of volcanos, turns him into the Hornrimmed Monster. The Hornrimmed Monster uses that to his advantage and causes an inactive volcano in Reefside to be active again. The Power Rangers are forced to deal with him, and the Black Ranger uses Super Dino Mode to stop him in his tracks, while Conner finishes the job with the Battlizer. When the volcano is about to errupt, the Thundersaurus Megazord catches a wave with the Stega Surfboard to estinguish the volcano and destroy the monster. This allows Dr. Morton to be returned to normal.
- Trinoid 11: Ayameganezumi - Super Sentai counterpart in Bakuryuu Sentai Abaranger. See comparison page.