Re: Best guest cast............
And Elisha Cook Jr. off "Court Martial." He was probably the biggest character actor who ever appeared in TOS.
And the reason I voted for that episode in the poll.
Also a very big fan of William Windom as Commodore Decker in The Doomsday Machine
USS Galileo Galilei, NCC-8888
Starbase 31, Daran V
Prima Inter Pares