Shaenon K. Garrity: When one character in Derek Kirk Kim's graphic novel Same Difference tries to bribe another with her M.U.S.C.L.E. collection—“I'll even throw in the garbage can containers!”—it triggered a wave of nostalgia for me and, I'm sure, many other Gen X nerds. They were always on the toy rack at Big Lots, those packages of weird little pink rubber homunculi. Aside from their wrestling singlets, they seemed to be freaks of some kind, with animal faces, robot bodies, pointy heads. To be honest, I wasn't a M.U.S.C.L.E. collector, gravitating more toward the Battle Beasts. But an air of mystery always hovered around the M.U.S.C.L.E. guys. Were they pro wrestlers? Athletes? Mutants? Monsters? Where did they come from?