Wikipedia
Skartaris
Skartaris is a fictional Hollow Earth fantasy setting created by Mike Grell for the sword and sorcery comic book The Warlord, published by DC Comics. Skartaris debuted in 1st Issue Special #8 (November 1975), where the character Travis Morgan, a U.S. Air Force pilot, discovers a passage into this world through the Earth's North Pole. Subsequent to that first issue, the Warlord series tells of Morgan's adventures in Skartaris.