It is not unheard of for The Flash to join forces with his enemies. The Rogues, while largely opportunistic criminals, do live by a code and have fought more murderous supervillains with the Fastest Man Alive. Even so, Absolute Flash #3 finds Wally West turning an unexpected enemy into a surprise sidekick.
Maria the robot from Fritz Lang's Metropolis inspired the creation of C-3PO. Now, she's got her own Star Wars style…
