"Mr. Mind is one of Captain Marvel’s most prolific Golden Age adversaries. You might not be able to see under that fetching diving helmet, but he is a worm. I have no idea why he’s a worm, but I guess there’s no reason why worms shouldn’t dream of riding armored seahorses and controlling the world through giant squids."
Marvel Comics Retro: The Invincible Iron Man Comic Book Cover No.58, Facing Captain America (aged)