Bonanza - Season 13 - Eps 26: One Ace Too Many
While the Cartwrights are away to Carson City, ruthless land baron Bradley Meredith (Lorene Greene in a dual role) poses as Ben in a scheme to get control of the Ponderosa ... by pretending ""Ben"" is seriously ill and selling his holdings to friends.
About Bonanza

Title: Bonanza
First Air Date: 1959-09-12
Last Air Date: 1973-01-16
Status: Ended
Rating: 7.516/10 (from 441 votes)
Language: EN
Seasons: 14
Total Episodes: 431
Network: NBC
Genres: Western, Action & Adventure, Drama, Family
Production Companies: NBC, NBC Studios
Synopsis
The High-Sierra adventures of Ben Cartwright and his sons as they run and defend their ranch while helping the surrounding community.
Cast

Lorne Greene
Ben Cartwright

Michael Landon
Joe Cartwright

David Canary
Candy Canaday

Tim Matheson
Griff King

Mitch Vogel
Jamie Hunter Cartwright