The first of two appearances in the series by Arthur Gomez, the other being in an uncredited role in E26, The Girl with Grey Hair (1960).
The second of three appearances in the series by Julian Sherrier, the others being in E7, Diamond S.O.S. (1959) and E28, Ascent to Murder (1960).
The first of two appearances in the series by Philip Ray, the second being in the final program E39 The Absent Assassin (1960).
The second of four uncredited appearances in the series by Dickey Luck, the others being E7, Diamond S.O.S. (1959), E23 Payment in Advance (1960) and E32 In the Swim (1960).
The second of two uncredited appearances in the series by George Curtis, the first being in E8, Private View (1959).