Bio Planet WoO (生物彗星ＷoO, Seibutsu Suisei Ū?) is a "kyodai" (giant hero) themed tokusatsu that premiered April 9, 2006 and aired at 7:30pm on NHK and ran for 13 episodes. WoO was one of many unused ideas created by the late-Eiji Tsuburaya as story connecting to the show, Ultra Q. The story revolves around a living creature which came from a comet named WoO; in the series, WoO is befriended by a young girl named Ai; both are chased by a mysterious organization called SWORD who sees WoO as a threat to humanity. At the same time, giant monsters have invaded in search of WoO. The story itself follows the original script Tsuburaya intended for the show.