When John meets an alien who feeds on electricity, things start to go wrong
5.4
55 min
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.
| Name | Character | Team | |
|---|---|---|---|
| Mark Dightam | John | Unowned | |
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Robert Eddison | Nick | Unowned |
| Helen Weir | Mrs Saunders | Unowned | |
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Brian Worth | Mr Saunders | Unowned |
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Esmond Knight | Doctor | Unowned |
| Laurence Carter | Schoolteacher | Unowned | |
| Patrick McAlinney | Supreme Beefeater | Unowned | |
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Lem Dobbs | Munro | Unowned |
| Nigel Rathbone | Schoolboy (uncredited) | Unowned |