Bio Planet WoO (生物彗星WoO or Seibutsu Suisei Ū; literally "Living Comet WoO") is a "kyodai" (giant hero) themed tokusatsu that premiered April 9, 2006, and airs at 7:30pm on NHK and ran for 13 episodes. WoO was one of many unused ideas created by Eiji Tsuburaya as a story connecting to the show Ultra Q.
The story revolves around a creature named WoO, which came from a comet. In the series, WoO is befriended by a young girl named Ai; both are chased by a mysterious organization called SWORD, which 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.
Bio Planet WoO provides examples of the following tropes:
- Attack of the 50-Foot Whatever: By the makers of the Ultra Series, so naturally there are bad 50-Foot-Whatevers who need to be stomped by our friendly one. Aside from WoO there is Gelnake, Galrobe, Gelbio, Gelbile, Gelbile MK, and Gelnoide.
- Bond Creature: WoO and Ai's bond allows them to merge, making him stronger. She also feels what he's feeling even when they're separated (or at least, MIB examination upon him hurts her just as much at a distance).
- Death of a Child: Usually in a series like this children don't die, unless it's a Fridge Logic sorta "there had to be kids caught up in that wide-area-affecting Bad Thing" situation. However, an early Monster of the Week named Gelnake pulls everyone in Ai's school but Ai, who was protected by WoO, into itself. After its destruction, they — which would have to consist of a few dozen faculty and hundreds of children, do not return. A later scene shows frantic parents trying to find out what happened. And then in a complete Twist Ending nobody actually died, they were just in suspended animation after the monsters ate them and were released after WoO's comet reformed.
- General Ripper: Yaman doesn't differentiate between good and bad alien life forms. It's revealed that his daughter was one of the victims of the Gelnake attack.
- Monster of the Week: Subverted as they only appear in some episodes much like in Ultra Q; all of them are named above.
- Ridiculously Cute Critter: WoO's normal form, reminiscent of either a Zora tadpole or an In-Training Digimon. Don't think that means he can't kick butt while in this form, though.
- Sleep-Mode Size: After exhausting his energy battling giant monsters, WoO reverts to a small, immobile "Fossil Form".