Bio Planet WoO (生物彗星ＷoO, Seibutsu Suisei Ū) is a Kyodai Hero tokusatsu series produced by Tsuburaya Productions, 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 Eiji Tsuburaya as story connecting to the show Ultra Q.

At the same time, giant monsters have invaded in search of WoO.

The story itself follows the original script Tsuburaya intended for the show.

A year after the show ended its run a manga Shoujo series of the same name was published.