4 books in series

Zarkon - Lord of the Unknown

Zarkon - Lord of the Unknown is a 4-book series with 4 primary works first released in 1975 with contributions by Lin Carter.

Zarkon, Lord of the Unknown in The nemesis of evil: A case from the files of Omega
Zarkon: Lord of the Unknown in Invisible Death
Cover 6

The Volcano Ogre

Cover 2

The Earth Shaker