I love watching The Virginian and this is one of the biggest reasons why. There was an episode with DeForest Kelley playing an army doctor and his patient was Leonard Nimoy. There have also been episodes with James Doohan, including one where he spoke with a Scottish accent.
Harrison Ford is in two Season 5 episodes. There's also a lot of fun in seeing the same actors over and over again playing different roles. Royal Dano, Andrew Duggan, Leslie Neilson, John Dehner, John Anderson, and others.
It was amazing that they made around 30 episodes a season and they were all 90 minutes. It's also funny how there's barely any continuity. They just have stories with very little reference to the past. Love interests that just disappear. Some episodes are clearly out of order.
You can also learn a lot about history. This year is the 150th anniversary of Wyoming giving women the right to vote. Teddy Roosevelts Rough Riders charged up San Juan Hill on foot. A teamster is someone who drives a team of horses. A drummer is a salesman (That adds a whole new dimension to "my mother told me to never date a drummer 🙂).