During the first two seasons the clerk was played alternately by Jack Harris and Jack Gargan. Midway through season 2 George E. Stone took over the clerk's role, and remained with the series through season 6; Stone alternated with actors Charles Stroud, Olan Soule, and Hans Moebus.
In the first two seasons, the character of the clerk was played by Jack Harris and Jack Gargan.  George E. Stone took over the role midway through season 2, alternating with actors Charles Stroud, Olan Soule, and Hans Moebus until the end of season 6.