The Sumo of All Fears is the ninth episode in season 1 of the Kappa Mikey series. In the beginning of the episode, Mikey is unable to lift a prop on set. This leads him to decide to go to a gym and become stronger. He meets a sumo named Yokuzuna who becomes Mikey's rival. A mysterious trainer helps train Mikey to allow him to defeat him. Meanwhile Gonard is working on his tennis game, but is defeated by the ball machine. The rest of the crew asks what happened, but Gonard simply says the assailant sounds just like a ball machine.
- In this episode Mikey does a famous dance called the "Macarena."
- In the opening scene when Gonard is holding Lily and a bus full of children with ropes is possibly a reference to a scene in the 2002 movie "Spider Man."