'The Unearthly Prophecy' by Jack Kaplan and John Barrett

Pursued through the desert by General Urko and his gorilla army, Bill and Jeff take refuge in a hole and find themselves inside the ruins of the New York Public Library. As they make their way through the rubble-strewn underground city, they come across a huge cavern above a giant power complex, which is operated by mysterious cloaked and hooded figures. They then see their lost comrade, Judy, also wearing a robe, and seemingly in a trance. Bill and Jeff are captured and learn from their leader, Krador, that they are the Underdwellers, descendants of the humans who sought safely underground during the holocaust many centuries ago. Krador goes on to tell the two astronauts that their prophecy foretells that Judy will help them return to the surface world, and reclaim it from the apes…

Richard Blackburn (Bill Hudson / Doctor Zaius), Henry Corden (General Urko), Phillippa Harris (Zira), Edwin Mills (Cornelius), Claudette Nevins (Judy Franklin / Nova), Austin Stoker (Jeff Carter)

Directed by Doug Wildey (Uncredited)
Produced by David DePatie and Friz Freleng
Associate Producer Doug Wildey
A DePatie-Freleng Enterprises production

TX (US): 4th October, 1975

Notes:
*Featuring Bill Hudson, Jeff Carter, Judy Franklin, Zira, Cormelius, Doctor Zaius and General Urko