This is the second of three appearances Phyllis Coates makes in the series, each time playing a different character. She is perhaps best remembered as the original Lois Lane in the 1950s TV series Adventures of Superman (1952).
This is the eighth of 20 appearances Frank Wilcox makes in this series, each time playing Federal DA Beecher Asbury. While still appearing in this series, he took on the recurring role of oilman John Brewster, a role he is perhaps best remembered for, in the hit TV sitcom The Beverly Hillbillies (1962).
This is the fourth of eight appearances Frank DeKova makes in the series. Except for the first season, when he appears as Louis Campagne three times, all his other appearances are in the roles of different sinister characters, roles he frequently played throughout his acting career. Even so, he is perhaps best known to audiences from the 1960s for his recurring role in a TV sitcom as Chief Wild Eagle from F Troop (1965).