Crom was the creation of Gardner Fox and first appeared in Out of this World #1 (1950) from Avon. Fox tells us that Crom’s adventures come to us courtesy of “long-lost parchments recovered in an underwater upheaval, translated by a lingual expert,” but I suspect he made it all up. He also took a lot of inspiration from Howard's Conan yarns.
Anyway, Crom’s a yellow-haired Aesir living in an age forgotten by history, and he’s got a problem. His sister Lalla have been kidnapped by ape-men called Cymri (which may or may not tell us how Fox felt about the Welsh). Crom makes short work of the ape-men, but he and Lalla wind up adrift.
They end up on an island. Good news: It’s full of lovely women. Bad news:
The wizard is named Dwelf, and he’s got a job for Crom. Dwelf wants him to bring back water from the fountain of youth which was built by “people from the stars" and will one day be lost “under what men will call the Sahara desert.” Dwelf threatens Lalla if Crom doesn’t get the stuff for him--and then hypnotizes him to make double sure.
Crom sails to fabled Ophir. He sneaks into the city and while he’s casing the tower that houses the fountain, he meets a girl who doesn’t really get the concept of sword & sorcery tavern-dancing:
Crom takes the girl (Gwenna) dancing and formulates a plan to get into the tower by first being thrown in jail. It works, but once at the tower, he’s got to fight panthers and some guards. He dispatches them all with his sword “Skull-cracker.”
When he gets to the fountain he finds he guarded by a giant snake! He kills it, too, but is almost done in by the queen of Ophir, herself, Tanit. He takes her hostage so he can get out of the city:
By the time they’ve escaped though, Tanit has warmed to Crom and is asking him to come back and be her king! She and Crom deliver the water to Dwelf, who suffers the ironic fate of being turned into an infant.
Not really into childcare, apparently, Crom leaves the wizardling and decides he and Tanit should head back to that kingdom she’s promised him--with his sister Lalla, too, of course. They don’t make it back without adventure, but that ends this particular issue.
Crom goes on to have two more improbable adventures in the pages of Strange Worlds.