User blog comment:20thCentFopp/How Dr. Doom Was Upstaged By Pirates/@comment-4652104-20131214160426

It occured to me, that it may have been worse for Doom, it's possible that the greatest villain in Marvel started of as an afterthought. Stan wanted to send the Fantastic Three to fight pirates and Doom was added just as a reason for them to go.

Fun fact: in the 1998 Marvel Superheroes Adventure Game, Dr Doom is the highest value card :)