Are Legion takes place on an alien world with various separate underground societies that the protagonist must work her way through on a long journey back to the surface. Comics A Scrooge McDuck comic book story by Carl Barks called Land Beneath the Ground! (1956) describes an underground world populated by humanoid creatures who create earthquakes. The comics series Les Terres Creuses by Belgian comics writers Luc and François Schuiten features several hollow-Earth settings. The Hellboy Universe features the Hollow Earth as a major part of its mythology. It was first introduced in the 2002 miniseries B.P.R.D.: Hollow Earth, when the team journeyed into great caverns inside the Earth where they discovered a race of people that had been artificially created by the ancient Hyperboreans. One adventure of Alan Moore's Pulp-style hero Tom Strong involved a gateway into the Hollow Earth in the Arctic where Nazis had fled after World War Two only to be devoured by its inhabitants. Much of the story is spent discussing many of the varying Hollow Earth concepts mentioned above. (Tom Strong's Terrific Tales #1) In the 1970s, comic-book artist Mike Grell produced the comic-book Warlord, about a pilot who finds himself in Skartaris, a sword-and-sorcery world reached through an opening at the North Pole. First believed to be the hollow interior of the Earth, Skartaris was later revealed to be a parallel dimension. The Marvel Comics features several underground empires in Subterranea with each one ruled by villains like the Mole Man or Tyrannus. The webcomic Overcompensating referenced Hollow Earth theories in an August 2006 strip. Super Dinosaur has shown Earth to be a planet with a planet on the inside. The webcomic Mare Internum follows the adventures of two scientists trapped in the underworld of Mars. Film The 1935 serial The Phantom Empire combines a western musical with subterranean plot elements loosely adapted from Bulwer-Lytton's The Coming Race. The 1951 short feature Superman and the Mole Men postulated a race of little people living inside a hollow Earth. The film was later reconfigured into a two-part TV episode called The Unknown People, with most or all explicit references to "Mole Men" being excised. The 1951 film Unknown World is the story of a small crew in a drilling vehicle exploring for a refuge from nuclear war, and finding great caverns at tremendous depths. The 1956 film The Mole People has an introduction by