Boy Who Turned Yellow, The (1972)

John (Mark Dightam) goes on a school trip to the Tower of London. While he is there he loses his pet mouse and vows to return and find her later. Back in school, he falls asleep during a lesson about electricity so his teacher sends him home. On the “tube” there is a sudden flash, and John, the train and all of the passengers turn yellow. With the help of Nick, short for “Electronic” (Robert Eddison), John learns about electricity, invades the Tower of London and saves his pet mouse … or was it all a dream?