There was a couple of early 1 shot attempts at doing horror comics prior the genre really taking off. The first was Spook Comics #1 by Bailey Publications. It came out in 1946 featuring a Mister Lucifer story. The horror tale starts when some crooks on the run try to stash their loot in a graveyard coffin. The crooks unknowingly release Mister Lucifer who had been captured in there thanks to the tombstone. Lucifer is of course, the devil and he summons up spirits to do his evil deeds. They go around wreaking havoc on mankind until he accidentally falls into wet cement, incasing him in a new "tombstone."