On their latest assignment, under-age agents Juni and Carmen Cortez (Alexa Vega, Daryl Sabara) journey inside the virtual reality world of a cool but crazy video game, where anything is possible, including the impossible. Tthe power-hungry villain the ''Toymaker,'' (Sylvester Stallone) wants to take over the youth of the world, and Juni and Carmen must battle their way through tougher and tougher levels of a three-dimensional game ingeniously designed to outwit and defeat them. Using their usual humor, gadgetry, bravery and family bonds, the Spy Kids must win every high-flying, puzzle-solving challenge, from racing road warriors to surfing on boiling lava.