ANTI-MASHUPS (-5)

 Here are two examples of groups of allomorphic monsters who all share the same origins and are therefore "isomythic." 

The first appeared in BORIS KARLOFF TALES OF MYSTERY #12, in which a typical American town plays host to a convention of club-members who call themselves "Kreepers" and who appear to be wearing an assortment of monster-masks. Big surprise, the Kreepers are all real monsters. The unbilled writer never supplies any origin for the disparate creatures but there's a loose solution that they're some "parallel race" that's existed on Earth for centuries. 

The second appears in issue #30 of the same title, in the story "Produce Me a Monster." A reporter investigates the secret of Karlarka, a Hollywood producer who makes horror movies with incredible makeup effects on his monsters. The reporter follows Karlarka to a remote island, and finds out-- yeah, you guessed it-- all of Karlarka's "actors" belong to an isolated race of allomorphic monsters, as does the movie-maker himself. I think this is the only story in BORIS KARLOFF in which the name of the comic's "host" is transparently parodied.