Joe Otterson TV ReporterThe new streaming service Discovery Plus is launching on multiple platforms as it debuts in the U.S.With the launch officially beginning today, Discovery Plus will be available to customers on the platforms: Roku; Amazon Fire TV streaming devices, Fire TV Edition smart TVs, and later on Prime Video Channels; iPhone, iPad, iPod touch and Apple TV, and the Apple TV app; Google devices and platforms including Android phones and tablets, Chromecast with Google TV and