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.

Cast:Mark Dightam, Robert Eddison, Helen Weir, Brian Worth, Esmond Knight, Laurence Carter,

Genre:Family, Science Fiction,

country:United Kingdom,

Production:Children's Film Foundation (CFF),