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When a living humanoid being (human or alien) is infected with Zonder Metal, it becomes a Zonder. Zonders will almost invariably fuse with mechanical objects and inorganic matter to form a biomechanical Zonder Robo. These Zonder Robos immediately seek out and eliminate the source of their stress, at which point they begin to produce Zonder Spores and mature into Zonder Metal Plants.
All Zonder Robos and Zonderian Robos are collectively identified by GGG using the code "EI" (standing for "Extraterrestrial Intelligence").