The Rifleman/The Tinhorn
Guest Stars: Joan Taylor (Milly Scott), Grant Richards (John Keeler), Grace Lee Whitney (Rose), Larry Thor (Jesse Phillips), Barbara Eiler (Mary Phillips), Jim Hayward (Joe Tucker), Stephen Wootton (Willie), Gary Gadson (Henry)
Mark and Milly are shocked when Lucas begins gambling. They don't know that Lucas is "undercover" trying to catch a man at cheating. Lucas must do this in order to save his friend's farm.