Sunflower Valley is going to stage its very first athletics tournament, complete with a special machine event! Bob, Wendy and the team are building a Sunflower Valley Stadium, but they need some special help - Gripper and Grabber - a crane and excavator, are very excited about joining Bob and the team.But what will happen when Wendy leaves Bob to join the athletics team and Gripper and Grabber go missing in Sunflower Valley?