TBS Holdings, Inc., is a privately owned media company in Japan. It is the parent company of the television network TBS Television and radio network TBS Radio. It has a 28-affiliate television network called Japan News Network, as well as a 34-affiliate radio network called Japan Radio Network. TBS produced the game show Takeshi's Castle and has also broadcast the Ultra Series programs and Sasuke, whose format would inspire similar programs outside Japan. TBS is a member of the Mitsui Group keiretsu and highly cooperating with the Mainichi Shimbun despite the latter's lack of shareholding. Wikipedia