Perry Mason/The Case of the Poison Pen-Pal
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The Case of the Poison Pen-Pal is the twentieth episode of the fifth season of Perry Mason, and the one hundred forty-third episode overall.
Additional Cast: Everett Sloane (District Attorney), Patricia Breslin (Karen Ross), Douglas Henderson (Peter Gregson), Bert Freed (Carl Holman), Wright King (Lee Gregson), Joan Tompkins (Florence Holman), Kathryn Givney (Wilma Gregson), Naomi Stevens (Agnes), Charles Cooper (Ben Willoughby), Harry Jackson (Matt Clark), Paul Genge (Inspector Wade), John Litel (Judge), Chrystine Jordan (Sandra Gregson), Diane Mountford (Jill Thatcher), Richard St. John (Autopsy Surgeon), Walter Kelly (Surgeon), Marshall Reed (First Officer), Diana Darrin (Mrs. Thatcher), John McKee (Woodfern), Sherry Hall (Court Clerk), Kathy Huber (Nurse)