Arnold Schwarzenegger is set to join the cast of the popular TV show Yellowstone. The action movie star will be appearing in the fourth season of the show, which has gained significant popularity since its debut in 2018. Schwarzenegger's participation in Yellowstone marks a significant addition to the already star-studded cast. The actor's involvement is expected to bring a new level of excitement to the series, which revolves around the conflicts and drama of a powerful family that owns the largest cattle ranch in the United States.