When did You Start to Stop Seeing Things?: Jeff is hired by a company to find out who is leaking information in the stock market. Finding Jeff suspiciously out of character — and also now being unable to see him — Marty finds out that the real Jeff has been captured and that the fake Jeff is an impostor, using his status to conduct murders of financial personnel. Marty uses a hypnotist to save the day.
cast
Mike Pratt as Jeff Randall
Kenneth Cope as Marty Hopkirk
Annette Andre as Jeannie Hopkirk
Ivor Dean as Inspector Large
Clifford Evans as Sir Oliver Norenton
Keith Barron as Jarvis
Reginald Marsh as James Laker
Bessie Love as Mrs. Trotter
Basil Dignam as Hepple
Peter Stephens as Sir Timothy Grange
Rosemary Donnelly as Diana
Philip James as Holly
David Stoll as Tilvers
John Garvin as Tully
David Downer as Hinch
Director: Jeremy Summers
Writers: Tony Williamson
Airdate: Sunday 23 November 1969
Season 1, Episode 10