Swamp of the Living Dead - S3.E20

The Legion of Doom makes a deal with an old swamp sorceress and her demon — an equivalent amount of the power of good in exchange for an equivalent amount of the power of evil. In order to gain that power of evil, the Legion decides to give the demon the Super Friends as the power of good. The Super Friends are captured and put to sleep in coffins. However, in the Legion of Doom's greed for more power, they capture the demon, believing he would give them an infinite source of power, and pay the price for it when he uses his powers to escape. Offended by this, he summons his army of zombies to attack them.