''Bio Planet [=WoO=]'' (生物彗星[=WoO=] or ''Seibutsu Suisei Ū''; literally "Living Comet [=WoO=]") is a "kyodai" (giant hero) themed {{toku}}satsu that premiered April 9, 2006, and airs at 7:30pm on Creator/{{NHK}} and ran for 13 episodes. ''[=WoO=]'' was one of many unused ideas created by Creator/EijiTsuburaya as a story connecting to the show ''Series/UltraQ''.

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:

* AttackOfThe50FootWhatever: By the makers of the ''Franchise/UltraSeries'', 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.
* AdjectiveNounFred
* BondCreature: [=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).
* ABoyAndHisX: A girl and her transforming cute alien thing.
* GeneralRipper: [[spoiler:Yaman]] doesn't differentiate between good and bad alien life forms. It's revealed that [[spoiler:his daughter was one of the victims of the aversion of InfantImmortality mentioned below.]]
* InfantImmortality: Averted. Usually in a series like this children don't die, unless it's a FridgeLogic sorta "there had to be kids caught up in that wide-area-affecting Bad Thing" situation. However, an early MonsterOfTheWeek named Gelnake [[spoiler: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 TwistEnding [[spoiler:nobody actually died, they were just in suspended animation after the monsters ate them and were released after [=WoO=]'s comet reformed.]]
* {{Kaiju}}
* TheMenInBlack: SWORD.
* MonsterOfTheWeek: Subverted as they only appear in some episodes much like in ''Ultra Q''; all of them are named above.
* PacingProblems: Combined from a 28-minute run time per episode and extremely little action, making it very easy to get bored for those not used to SliceOfLife dramas.
* RidiculouslyCuteCritter: [=WoO=]'s normal form, reminiscent of either [[VideoGame/TheLegendOfZeldaMajorasMask a Zora tadpole]] or an [[Franchise/{{Digimon}} In-Training Digimon]]. Don't think that means he can't kick butt while in this form, though.
* SleepModeSize: After exhausting his energy battling giant monsters, [=WoO=] reverts to a small, immobile "Fossil Form".