text: Peter Gilmore (1931–2013) (11) usually had supporting roles.  He occasionally played the villain, (Cabby, Jack, Don't Lose Your Head). He returned for Columbus.
  Marianne Stone (1922–2009) (9) played a range of minor and supporting roles across almost the entire run of the series (from Nurse to Behind).  In addition to those 9 roles, her character in Matron was cut from the finished film, although she remained credited in the opening titles, whilst she provided uncredited voice-work in Constable when she dubbed actress Lucy Griffiths' dialogue.  She also appeared in one episode of the Carry on Laughing TV series.
  Billy Cornelius (born 1934) (8) was a regular stuntman and small-part actor during much of the series.  His most substantial role was as one of the monsters, Oddbod Jr., in Screaming.  Other credited roles are in Again Doctor, Henry, and Dick.  Additional uncredited roles are in Cowboy and Don't Lose Your Head.  He also appeared in the 1970 Carry On Stuffing Christmas TV special, and three episodes on the Carry On Laughing TV series.
  Frank Forsyth (1905–1984) (8) was a regular small-part player.  Although he was uncredited for his brief appearance in Again Doctor, his remaining roles gained him on-screen credits (Sergeant, Nurse, Constable, Cabby, Jack, Spying, and Screaming).