The first of two appearances in the series by Arnold Diamond, the other being in E33, The Three Keys (1960).
The first of two appearances in the series by Colette Wilde, the other being in E37, Desert Hi-Jack (1960).
The first of two appearances in the series by Leonard Sachs, the other being in E21, The Collector (1960).
The first of two uncredited appearances in the series by Ernie Rice, the other being in E21, The Collector (1960).
The first of four uncredited appearances in the series by John Tatham, the others being E7, Diamond S.O.S. (1959), E15 Last Man Lucky (1959) and E31 A Foreign Body (1960).