The third of four uncredited appearances in the series by Dickey Luck, the others being E7, Diamond S.O.S. (1959), E11 The Angola Brights (1959) and E32 In the Swim (1960).
The fourth of six uncredited appearances in the series by Guy Standeven, the others being in E1, The Thirteen Innocents (1959), E12 The Chinese Mask (1959), E16 No Flowers for Onno (1959), E31 A Foreign Body (1960) and E36 Cargo of Death (1960).
The second of two appearances in the series by Walter Gotell, the first being in E2, The Money Game (1959).
The second of three appearances in the series by Carl Duering, the others being E21, The Collector (1960), which was uncredited, and E31 A Foreign Body (1960).
The first of two appearances in the series by Caroline Leigh, the other being in E35, Dressed to Kill (1960).