Name Source Type Iberons Imperium Galactica II: Alliances Ibs Robert J. Sawyer's Starplex Ice Warriors Doctor Who humanoid Iconians Galactic Civilizations II: Dread Lords Iconians Star Trek Ifshnit Star Frontiers Humanoid, meter-tall Ikrini Battlelords of the 23rd Century Ilanics Farscape Humanoid Ilwrath Star Control Spider-like Impostors Among Us Imsaeis Master of Orion Imskians DC Comics' Legion of Super-Heroes Ing Metroid Prime 2: Echoes Beings native to a dark mirror dimension. Some can change into forms relating to solid, liquid, and gaseous states. They have the ability to possess and corrupt both living and dead creatures. Main enemy to Luminoth. Insects The History of the Galaxy series Interions Farscape HumanoidInterplanet JanetSchoolhouse Rock! Invid/Inbit Robotech: The New Generation and their counterparts from Genesis Climber Mospeada crab-like Irkens Invader Zim Green humanoids (usually small) with an appetite for destruction Isanians Perry Rhodan Ishtarians Poul Anderson's Fire Time Ithanites Star Trek Ithkul Master of Orion III Ixtl The Voyage of the Space Beagle by A. E. van Vogt