The second of two episodes written by Anthony Eisley. (The first was the second season episode Girl on a String (1960).)
This was the fifth of seven appearances by frequent guest star Robert Colbert, all in different (and usually villainous) roles; this may account for his guest star billing at the top of the show.
Vaughn Taylor and Robert Conrad worked together again on The Night of the Double-Edged Knife (1965).