Gunsmoke - Season 19 Episode 13 : The Deadly Innocent 1975

Billy comes back to Dodge because he has trouble finding anyone to listen to his stories and visit Festus who is a friend of his. Billy retarded and tells Festus a riddle and the answer given isn't funny to Billy, Doc tells Festus that Billy has the mind of a seven or eight year old and needs better care. Billy sees a man hurting a cat and almost kills the man, not knowing that what he did was wrong Matt and Festus talk to Judge Brooker and Festus becomes a guardian to Billy. When a deer is shot for food Billy attacks Festus. Festus has a hard time trying to make Billy understand why the deer was shot. Doc tells Festus to take Billy back to where he came from but finds that hard to do. They go to the place Doc suggested and Billy gets worried about the noises inside the place. Festus tells Billy he is going to kill rabbits for dinner and try to give Billy a taste of life. Matt, Doc & Festus find Billy telling kids stories at an orphan's home.