The second episode of the BBC’s short-lived science fiction series Moonbase 3 premieres. Peter Miles guest stars. 
The unexplained disappearance of two astronauts conducting a survey on the surface of the moon brings the prospect of further moonwalks to a halt. Caulder orders no further moonwalks in the survey area, which infuriates seismologist Dr. Heinz Laubenthal, whose studies have concentrated on that very area – though he refuses to say why he’s so interested in it. A mysterious accident depressurizes the seismology lab, exposing it to cold vacuum and killing Laubenthal; rumors begin to run rampant that his experiments on the moon’s surface may have awakened some previously undiscovered life form which is now seeking revenge. Other moonbases pick up on the rumor and a siege mentality quickly sets in. Caulder decides to lift his ban on exploration in Mare Frigoris and personally investigate what’s going on – but if something or someone evil is behind the disappearances, even he may not survive this mission.
written by John Brason
directed by Ken Hannam
music by Dudley SimpsonCast: Donald Houston (David Caulder), Ralph Bates (Michel Lebrun), Fiona Gaunt (Helen Smith), Barry Lowe (Tom Hill), John Hallam (Peter Conway), Tom Kempinski (Stephen Partness), Peter Miles (Heinz Laubenthal), Garrick Hagon (Bruno Ponti), Dennis de Marne (Guido Mirandelli), Jurgen Anderson (Per Bengison), John Moreno (Alan Benavente), Derek Anders (Dr. Andrew Robertson), Robert La Bassiere (Bill Jackson), Anthony Chinn (Cheng), Christine Bradwell (Ingrid), Cy Town (Technician), Ken Haward (Foreman)
LogBook entry by Earl Green