Daryl Sabara. Actor: Spy Kids 3: Game Over. Daryl Sabara is an American actor who is known for playing Juni Cortez from the Spy Kids franchise, Generator Rex from the cartoon of the same name and Hero Boy from the Robert Zemeckis Christmas film The Polar Express. He also acted in John Carter, Ultimate Spider-Man, A Christmas Carol, the Rob Zombie remake of Halloween and Wizards of Waverly Place. He...