NULL-CROSSOVERS #7

 Two more null-crossovers in which an established villain appeared with a newbie, but the newbie failed to become a recurring figure from then on.

First, from 1950, The Catwoman and one-shot gang-boss Mister X"

Fifteen years later, we get the mashup of established villain The Green Goblin and one-shot-who-gets-shot-dead The Crime Master.