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Marvel's Greatest Comics (1969) #23 - Comic Book DB
Issue Tagline: Starring: The Fantastic Four! The fabulous F.F. in blazing battle at the EARTH'S CORE! Featuring (who else?) The MOLE MAN! BONUS! Ol' Shellhead and the Sorcerer (That's IRON MAN and DOC STRANGE to non-believers!), in two of Marvel's Mightiest Sagas!