Superman: The Animated sereis (season 2, episode 3)

The Prometheon Release date: 091297 Plot: During a mission in space, Superman discovers a massive humanoid stone giant named the Prometheon latched to an asteroid. Prometheons restraints break loose and he plummets to Metropolis. It causes devastation and accumulates energy by sucking up heat from firepower and power plants. The episode is named after Prometheus, who stole fire from the Greek gods.