The Case of the Poison Pen-Pal A casual pen pal relationship leads to insider information and murder. Details Casts Title The Case of the Poison Pen-Pal Genres Mystery Drama Crime Release Date 1962-02-10 Episode Runtime 00 Hours 52 Minutes Season Number 5 Episode Number 20 Production Companies Paisano Productions, TCF Television Productions, CBS Raymond Burr Perry Mason Barbara Hale Della Street William Hopper Paul Drake William Talman Hamilton Burger Ray Collins Lieutenant Tragg