Geldor is the main villain of The Secret Liquid of Life!
He tries to get from Torgul the secret location of the liquid to get eternal life, and has his sorcerer creating an illusion of Torgul's daughter Maran prisoner to trick him into revealing that the liquid is buried in the Ogre's Cavern in the Mystic Mountains.
Prince Dakon, Maran's fiancee, gets the help of the Heroic Warriors to reach the Ogre's Cavern, but Geldor arrives and shows he has captured Teela and Maran, and this time it's no illusion. He-Man seems to hand the liquid to Geldor, but instead drops it at his feet. It falls into a small plant that turns into a tree that carries and seemingly devours Geldor.
His Masters of the Universe Classics bio reveals he survived.