To protect themselves from Hacker’s constant attempts to capture cybersite Happily Ever After, the king and his fairy-tale subjects construct a glass skywall to keep Hacker out of the kingdom. Hacker unfolds a brilliant scheme to crack open the skywall. He plans to use Wicked's voice. Can the kids use models to outwit Hacker before the witch sings? Part of the "Cyberchase" series.