Atomic Skull Vs. Red Skull

 

The Atomic Skull may have one of the goofiest villain costumes in comics (he later got a cool upgrade that was perhaps a bit too close to Ghost Rider's look), and may have never left the C-List of Superman Rogues... but I've always really liked the character.  Despite his appearance, he's appeared in some pretty fun stories.

Ghost Rider Vs. The Atomic Skull

The Atomic Skull may have never made it past C-Level Superman Villain status, but personally I have always really liked the character.  His original costume is full of Silver-Age cheese in all the right ways.  In later years, he got an updated look, more closely resembling Ghost Rider.  Even if he had a more derivative appearance, I still quite enjoyed the stories he appeared in.  I enjoyed the idea that he wasn't all there, and perceived his life to be part of a cliffhanger movie serial.