Crusaders of the Atom..Are there parallel dimensions in which history turned out differently? Are there other universes with other Earths where the alternates became the realities? The "demon" was Baphomet--a stranded extra-terrestrial--and his alliance gave the Templars the atomic arms and scientific equipment to create the empire Baphomet needed for his own outer-space motives.
Used availability for Pierre Barbet's Baphomet's Meteor
December 1972 : USA Mass Market Paperback