Swamp of the Living Dead

The Legion of Doom negotiates with an old swamp sorceress and an ancient demon to bring all the Super Friends to the swamp to defeat them forever in exchange for power to control zombies. The Superfriends are dragged into containers and knocked out by gas. The Legion test out the undead army by conquering a nearby power plant. However the Legion try to capture the demon, causing him to turn the zombies against them, making them release the Superfriends. The old sorceress tells the Superfriends to stop the zombies they must tie them to dead trees with dead vines. This succeeds, but the sorceress says as she has done a service to good she must do one for evil, and she makes the Legion vanish before they can be captured and turns into the demon.