|This article is about a/an monster in Power Rangers Dino Thunder.|
When Elsa creates Thornax, he is but a baby plant. When Mesogog demands a finished product, she goes to get some green ooze, which is also used by the Black Ranger to demorph, but he makes a disappearing act and is stuck invisible because of it. Elsa uses the ooze to make Thornox mature into a fullgrown monster. Thornox fights alongside the evil White Ranger, and then after he is defeated by Super Dino Mode, he is then defeated by the Mezodon Megazord.