Randor, Clamp Champ, Adam, and the Sorceress arrive at Eternia Tower at midnight. The purpose: to find out what happened to Randor's lost brother Keldor (Skeletor: "They must never discover the secret of Keldor, for that knowledge could destroy me!") So he sends Ninjor and Scare Glow, from Eternia's history and future, to stop them. They can't, and Skeletor ends up melting away into nothingness in the jaws of the Eternia Tower later after He-Man throws him there.US monolingual commemorative replica version in USA:
1987, Series 6.
Packaged with Faker, Ninjor, Scare Glow, King Randor, Clamp Champ and the Sorceress.
The comic was also available as
"The Search for Keldor"
29001-0900English/German/Italian/French quadrilingual version in Europe and Canada:
"The Search for Keldor" (UK/Canadian English)
"Auf der Suche nach Keldor" (German)
"Alla Ricerca di Keldor" (Italian)
"A la Recherche de Keldor" (French/Canadian French)