There's no mercy in America's Blackbelt Byway where martial arts rivalries between instructors and dojos fuel epic showdowns for bragging rights and monstrous six-foot trophies. Start Streaming ► discoveryplus.com/show/kiddie-kai-us Subscribe to discovery+ on YouTube: bit.ly/SubscribeDiscoveryPlus Facebook: facebook.com/discoveryplus Instagram: instagram.com/discoveryplus Twitter: twitter.com/discoveryplus