Indeed he was a Melkot, too. Good pick up.
That's a good point about the "all guest star episode"! It's interesting in these early episodes to see that very few of the team are utilised some weeks, and, yes, Rollin/Landau is always a "guest star" at this point.
I really think Steven Hill makes a very cool team leader. I think Herb Solow wrote about having to fire Hill refusing to work weekends for religious reasons or something? A shame, I think he's great.