S1·E35 Blast Off

Yun and his classmates are going to a space center for a school tour. As a bonus for the group, they get to see a real space shuttle launch from a mission control center. However, Yun got separated from his classmates because he loved the shuttle simulator so much. He ends up in the real shuttle and takes off with two unsuspecting astronauts to outer space. How is Jett supposed to bring Yun back to Earth?