Two robots, Smash and Grab, live on a futuristic Mars-like planet and work on a steam train fueled by glowing rocks. They're held back by their power cables until Smash discovers a world outside and steals batteries from other robots, freeing them to escape.

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Two worn-out robots, once confined to a massive locomotive's engine room, attempt a daring escape to break free from their servitude and form an unexpected bond.