Doctor Who: Planet of Giants (TV)

The TARDIS doors open while the ship is still in flight by accident. Although they have arrived back on Earth in the 1960s, the travellers discover that they have all be reduced to just inches in height and the world they are now exploring has dangers at every turn… Aside from being on guard against the onslaught of huge insects and domestic animals, the Doctor, Ian, Barbara and Susan crew find themselves against a backdrop of espionage and murder as Barbara is poisoned by a new form of pesticide about to be tested.