Probably an ancient question on here, but every once in a while, to this day, I'll watch an episode and the realization/reminder that "Hey, so-and-so is a good actor!" still occurs. My latest is Harry Townes, from Return of the Archons. He really makes the episode worthwhile to me. Next time you watch it, specifically watch him. He really utilizes every second of time to accentuate his character. From gestures, eye movements...it's a really good performance!