The tenth and final episode of The Changes airs on BBC1, adapting the novels of Peter Dickinson into a ten-part television serial starring Vicky Williams and Keith Ashton. Oscar Quitak (Brazil) guest stars. The series was filmed in 1973, but has been held for broadcast until 1975; an entire generation of young viewers will go on to consider the short series a seminal event in UK genre TV. 
Nicky and Jonathon sneak into the cavern and lock Mr. Furbelow out. They venture deeper, until a strange pulsating noise scares Nicky back out again. She gathers her strength and they go further into the caves until they find a tall, standing stone, from which Nicky hears a muffled voice. Jonathon hears nothing, but Nicky starts speaking to it, pleading the case for humanity and its machines with a primal force that, in seeking to restore balance to the world, has thrown things even further out of balance.
written by Anna Home
based on the novels by Peter Dickinson
directed by John Prowse
music by Paddy KingslandCast: Vicky Williams (Nicky), Keith Ashton (Jonathon), Oscar Quitak (Mr. Furbelow)
LogBook entry by Earl Green