Seibutsu Suisei WoO (2006)

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. "WoO" was one of many unused ideas created by Eiji Tsuburaya as a story connecting to the show "Ultra Q". The story itself follows the original script Tsuburaya intended for the show. (Source: DramaWiki)