The New Lion of Sonora (1) (S04E14)

In this special two-hour episode, Gilbert Roland makes a memorable appearance as the unexpected heir to the Montoya ranch. Following the serene passing of Don Sebastian Montoya, his daughter Victoria, son Manolito, John Cannon, and Buck gather at the ranch for the funeral and to sort out the estate. They are taken aback when the will reveals that the extensive Montoya holdings have been left to Don Sebastian's wayward brother, Don Domingo, a charming yet irresponsible man living in Mexico City. Upon returning to claim his inheritance, Domingo surprises everyone by announcing his intention to sell the ranch and travel. Mysterious raids on his newly acquired cattle and property begin to reveal a hidden side to Don Domingo.