Neither do I, but it did happen (sort of). Back in 1995 there was a movie; “Bonanza: Under Attack”, this was the third movie to continue the story of the original television series Bonanza. What makes this one so interesting? The fact that it stars Leonard Nimoy as Frank James.
It seems that Frank James has reformed, and is now on the run from some former Pinkerton agents who are out for his blood. He takes refuge on the Cartwright ranch, and they fight off the bloodthirsty vigilantes.