Begins Its First Season In September of 1974 (Fridays - 8:00—9:00 p.m.)   Network:                    CBS-TV Concept:        A drama about two astronauts whose space-ship passes through a time warp.  When they return to Earth, they discover 2000 years have passed and the planet is now being ruled by apes.  While spaceman Pete Burke is resigned to the prevailing adversity, astronaut Alan Virdon continues his quest to return back through the time warp to rejoin his wife and child.  Aware that humans once ruled the earth, chimpanzee Galen befriends and aids the two men escaping other constantly pursuing apes.   Cast:        Alan Virdon Pete Burke Galen Zaius Urko   RON HARPER JAMES NAUGHTON RODDY MCDOWALL BOOTH COLMAN MARK LENARD   Executive Producer:        Herbert Hirschman   Producer:        Stan Hough   Script Consultants:        Howard Dimsdale Ken Spears Joe Ruby   Directors:        Various   Writers:        Various   Production Supervisor:        Mark Evans   Post Production Supervisor:        Joseph Silver   Unit Production Manager:        Richard Glassman   Cinematographer:        Gerald Perry Finnerman   Makeup Supervisor:        Dan Striepeke   First Assistant Director:        Bill Derwin   Production Company:      20th Century-Fox Television