1. Lockjaw Alias: Sparky

Introduced in 1965 as a part of The Fantastic Four series, the name was perfectly created for this oddest of Marvel animal creations. Lockjaw’s biggest strength — his jaws made of steel that once clamped on an enemy, were impossible to breakaway from. One reason that might have contributed to Lockjaw’s lack of success was that his origin was never quite clear. Readers just couldn’t understand whether Lockjaw was a bulldog with superpowers or a mutated dog wherein super-abilities had been artificially infused. At one point it was told that he was a human who had been mutated into a dog, but that storyline as been buried. Further, Lockjaw’s ability to teleport, even from Earth to Moon, probably went a bit too far