Tweedledope is a member of the Crazy Gang. They were creations of Mad Jim Jaspers in an alternate reality known as Earth 238. In this reality, James Jaspers was a superhuman with vast psionic powers who succeeded in taking control of his world and killing off all of that world's superheroes in the process. The Crazy Gang, along with Mad Jim, would occasionally go on a crime spree through this apocalyptic world. He appears the most non-human, looking decidedly like a troll with a beanie, and never speaks but for grunts and giggles.
Tweedledope is an idiot savant, able to take any existing materials, even garbage, and create fantastic near-futuristic machines.