The Fossil Fuel Four is a team of Villians that killed Radioactive Man.
- The Fracker: He can blast out polluted water from the pipe he uses.
- Charcoal Briquette: She can shoot fire from the grill on her head
- Old King Coal: A super-humanoid that can fire coal from his scepter.
- Petroleus Rex: A dinosaur who can shoot gasoline from his arms.
- The Fossil Fuel Four is loosely based on the Frightful Four in Marvel Comics.