1x18 - The Law of Ueki

Ueki recieves an invitation to a "party" held by Robert Haydn. So, Ueki, Rinko, Inumaru and Mori all go to an arcade that leads to Robert's underground theme park called Dogura Mansion. There, Ueki fights in the first round against Yun-Pao, one of the new members of Robert's Ten.