Peter Miles stars as Tom Tiflin, the little boy at the heart of this John Steinbeck story set in Salinas Valley. With his incompatible parents -- the city-loving Fred and country-happy Alice -- constantly bickering, Tom looks to cowboy Billy Buck for companionship and paternal love.

On the planet Dido, the Doctor, Ian and Barbara meet two survivors from a crashed spaceship who are terrorised by the monster Koquillion.