When the TARDIS malfunctions, it and its travellers land on Earth at the size of insects. They uncover a murderous plot involving a new insecticide, but how can they stop the crime in their miniaturised condition?
William Hartnell
as The Doctor
Carole Ann Ford
as Susan Foreman
Jacqueline Hill
as Barbara Wright
William Russell
as Ian Chesterton
Alan Tilvern
as Forester
Frank Crawshaw
as Farrow
Reginald Barratt
as Smithers
Rosemary Johnson
as Hilda
Fred Ferris
as Bert
