|Written by||Louis Marks|
|Directed by||Mervyn Pinfield/Douglas Camfield|
|Produced by||Verity Lambert|
Returning to Earth, the crew find themselves trapped in a jungle with monstrous creatures pursuing them. Soon they realise that they have become miniaturized and are indeed on Earth.
In their miniature state, they discover dangerous experiments with a totally lethal insecticide are being performed but they seem powerless to stop them.