They are native to the planet of the same name, which Irken Invader Tenn was assigned to conquer as part of Operation Impending Doom II. However, Tenn's base was destroyed because of a package of malfunctioning SIR Units, which were supposed to go to Zim. In a two-part season finale (whcich was never made due to the show's cancellation), Zim and Invader Skoodge would have gone to Meekrob and rescue Tenn after she was discovered by the Meekrob and held captive.