Kavaxas

Kavaxas (aka Hot Head) is the secondary antagonist of the first 3 episodes, later main antagonist of the fourth episode of Season 5 of Teenage Mutant Ninja Turtles. He is voiced by Mark Hamill.

Bio
Kavaxas is an evil spirit who is lord of the Demodragons because he is the most powerful. He is also the ruler of the Netherworld and very temperamental.

Scroll of the Demodragon
Tiger Claw wanted the power of the Demodragon to destroy his enemies. He believed in summoning Kavaxas he gain all his might. So he performed a ritual after he had captured the Ninja Turtles, April O'Neil, and Casey Jones. He activated a seal in middle of altar and read a chant a scroll. The portal activated and fire burst through out the room. Kavaxas appeared, but immediately upon arriving he turned on Tiger Claw and attacked him with his fire breath.