John and his class visit the Tower of London, where he loses his pet mouse. He falls asleep during a lesson on electricity, but with some help, he learns about it, invades the Tower, and saves his pet.
Movie tag line: "When John meets an alien who feeds on electricity, things start to go wrong"
Production companies:
Character: John
Character: Nick
Character: Mrs Saunders
Character: Mr Saunders
Character: Doctor
Character: Schoolteacher
Character: Supreme Beefeater
Character: Munro
Character: Schoolboy (uncredited)