Who's This? Turn to page 8 of Who's Who vol. XVIII and you'll find Zoo Crew member Pig-Iron there. But did you know he had this whole life before becoming a superhero, dating back to the Golden Age?
How you could have heard of him: If you read any Zoo Crew stories, then you would know Peter Porkchops as his civilian identity, no more.
Example story: Peter Porkchops #2 (1950) by his creator, Otto Feuer
Who else? I'm a little backed-up and I can't do everyone anyway, so one last character from volume XVIII, ok? I just have to decide which VERSION of him I want to cover.