Randall and Hopkirk (Deceased) - 22 - It's Supposed to be Thicker Than Water

Playing postman to deliver an envelope to an escaped convict strikes Jeff as simple until he finds out it contains an invitation to murder; before long his own life is on the line.
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Written by Donald James
Directed by Leslie Norman
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Cast
Mike Pratt as Jeff Randall
Kenneth Cope as Marty Hopkirk
Annette Andre as Jeannie Hopkirk
Graham Armitage .... Young Stage Director
Felix Aylmer .... Joshua Crackan
Dick Bentley .... Mesmero
Meredith Edwards .... Hodder
Liz Fraser .... Fay Crackan
Earl Green .... Ramon
John Hallam .... Johnny Crackan
Neil McCallum .... Rev. Henry Crackan
Michael Ripper .... Punter
John A. Tinn .... Sung Lee Crackan
Robert Harbin .... auditioning magician (uncredited)
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Production
Although the 22nd episode in the series, It's Supposed to be Thicker than Water was the 8th episode to be shot, filmed between September and October 1968.