Work Robots appear in Super Metroid and Metroid: Zero Mission. They are stubby robots found in both the Space Pirate Mother Ship and the Wrecked Ship. While the Work Robots in Super Metroid are tall and can fire small round shots, the ones encountered in Zero Mission are small and unarmed; however, they often block narrow corridors, making them particularly annoying when Samus is in a hurry to pass by them. Both forms are immune to damage, but Missiles (especially Super Missiles) cause them to waddle away quickly, getting them out of Samus's way.