"Kingdom" is a raw family drama set against the world of Mixed Martial Arts (MMA) in Venice, California. Alvey Kulina (Frank Grillo) owns Navy St. MMA with the help of his girlfriend Lisa Prince (Kiele Sanchez). He is willing to go through extraordinary means to make sure his fighters are taken care of, but all of this responsibility comes at a steep price. He has complicated relationships with both of his sons, Jay (Jonathan Tucker) and Nate (Nick Jonas), who are both struggling with their own identities and places within Alvey's life and gym.