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Telly Savalas guest-stars as Charles Hackett, the richest man in the world. Accustomed to getting what he wants, Hackett now covets the Ponderosa. When Ben Cartwright refuses to sell, Hackett uses every method at his disposal-fair and foul-to force Ben off his own property. But in so doing, Hackett all but destroys the one person in the world he genuine cares about: his beloved wife Maria (Linda Lawson). Though not the final episode in which series regular Pernell Roberts appeared, this was the final one to be telecast, on April 18, 1965. "To Own the World" was written by Ed Adamson.