The Sound of Silence

Plot
An alien craft lands in woodland near the home of horseman Russell Stone. When Stone goes missing suspicion initially falls on Ben Culley, a tramp with whom Stone had recently argued over trespassing on his property. However, Culley is found dead and it seems likely that the green alien who killed him has captured Stone. The trail leads to a nearby lake where it seems likely that the alien is hiding....

Episode Cast

 * Burnell Tucker - G.S.P. 4 Co-Pilot Scott
 * Craig Hunter - G.S.P. 4 Pilot Hudson
 * Dolores Mantez - Nina Barry
 * Andrea Allan - Moonbase Operative Carol Miller
 * Ed Bishop - Cmdr. Ed Straker
 * Michael Billington - Col. Paul Foster
 * Ayshea Brough - SHADO Operative (as Ayshea)
 * Michael Jayston - Russell Stone
 * Susan Jameson - Anne Stone
 * Nigel Gregory - Ben Culley
 * Gito Santana - Alien
 * Richard Vernon - Pa Stone
 * Tom Oliver - 1st Technician
 * Malcolm Reynolds - 2nd Technician
 * Basil Moss - Dr. Frazer
 * Mel Oxley - Space Intruder Detector - SID (voice) (uncredited)

Episode Crew

 * Art Direction By Bob Bell
 * Art Department
 * Bill Macilwraith - Production Buyer
 * Camera And Electrical Department
 * Alan Perry - Camera Operator
 * Costume And Wardrobe Department
 * Jean Fairlie - Wardrobe Supervisor
 * Other Crew
 * Percy Edwards - Animal Voices
 * Ray Frift - Location Manager