Vannain is a hammerhead shark-themed monster and one of Space Empire Zangyack's Action Commanders. He's also the main antagonist in episode 34 of 2011 TV series called Kaizoku Sentai Gokaiger
Vannain returns to blew the Gokai Galleon up and intends to kill Luka off. But just as he is about to dispose of Luka, the other Gokaigers arrive to rescue her. They explain that Vannain was an imposter and had Fūraimaru use his illusion technique to stage their ship's explosion to deceive him and follow him to Luka. Vannain tricks Luka to walk into his trap, knocking her out to assume her form in order to take out her crew.
However, the Gokaigers see through the deception and trick Vannain that he has killed them so they can follow him to Luka. After being blasted by the Gokai Galleon Buster, Vannain tries to overwhelm GokaiOh and Goujyujin with sneak attacks as a building before being crippled by Goujyujin and then destroyed by Hurricane GokaiOh.
Super Hero Taisen
He later appeared as one of the many monsters in the Dai-Zangyack army, which eventually fought against an army of Super Sentai and Kamen Riders. He is briefly seen fighting Battle France of Battle Fever J with Nanonanoda and Isoginjaguar.
Space Empire Zangyack
Black Cross Army