The fierce Capellan power-cat hails from the planet Capella IV. Untamable, it will discharge 2,000 volts of electricity if even touched by another creature. Only a hypo with tranquilizer at its highest power setting can force the animal to be docile. The power-cat is approximately the size of an Earth lion, and has reddish-brown fur and dark dorsal spines. In 2270, several crewmembers from the U.S.S. Enterprise help free a captive power-cat from Kukulkan's intergalactic zoo aboard his ship. Kukulkan had kept the cat since it was an infant, pacifying it within a holographic environment. During the escape, Captain Kirk is hit with an energy discharge while tranquilizing the power-cat, but he survives.