Pedro Elias and Robin Pront unleash the fighters on themselves in "De kooiboys" (The Cage Boys). Television producer Pedro Elias and film director Robin Pront have been avid MMA fans for years. They've been discussing the sport for years on their podcast "Oep z'n bakkes," but they've always stayed safely on the sidelines. This time, they're taking the plunge themselves. For a year, they'll train with the world's greatest cage champions in various fighting disciplines. Along the way, they'll face their own limitations, fears, and prejudices.