Spencer Dutton (Brandon Sklenar) briefly appeared in Yellowstone, over 100 years after he was born, but he curiously wasn't in the prequel series 1883, and there's a simple explanation for that. Spencer Dutton was one of the best characters in 1923, the second Yellowstone prequel show. He was a crucial part of the Dutton family tree, and the ending of 1923 season 2 even confirmed that he was the grandfather of John Dutton III (Kevin Costner) in Yellowstone. As important as he was, however, Spencer never actually appeared in 1883, even though it followed his parents and siblings.