I had interesting fun doing a similar thread of best Star Trek acting, so I figured I'd do the same things with the TZ marathons I watch every New Year's & July 4th. Off the top of my head, my personal standouts: The Grave - Lee Marvin being every bit the badass you'd expect him to be, maybe a little more! Uncle Simon - The late Constance Ford was sort of like a female Brad Dourif: she delivers certain lines with such ferocious INTENSITY, it's like listening to the thunderous voice of some angry god! "I am no longer sowing, Uncle, now I'VE COME TO REAP!!!!" What a crazy acting flourish that was! The Masks - Robert Keith made the greatest, smartest, most interesting grouchy old curmudgeon of a man. I wish it were one of those rare 1-hour episodes so I could enjoy his wonderful scenery-chewing even longer. Don't worry if I forgot any, I'm sure I'll list more. These were just the first that came to mind.