Ben 10 season 3 episode 9 : The Unnaturals

Ben goes to see his favorite Little League team. Unfortunately, who should be on his team but his rivals, JT and Cash. He discovers that their opponents, the Squires, are robots. He cheats for his own team, but it works against them when the robots try to kidnap people on the team who appeared to be experts due to Ben's help. While attempting a rescue, Ben discovers that the robots plans are to replace the President of the United States, who had also been watching the game. The Tennysons foil the Squires' plan and personally save the president. After they have left, Enoch appears, revealing the plan to be his own. He vows that the Tennysons will pay with their lives.