The Andy Griffith Show
Nerys Myk wrote:
Any Trek actors popped up on Lucy's shows?
was at Desilu and plenty of TOS guests show up there.
Sheriff Taylor is Susan Oliver's "Keeper":
William Schallert, he was everywhere:
Ken Lynch from "Devil in the Dark" in his usual role, a cop:
Balok in a sharing mood:
Jahn of the Onlies is Barney's cousin Virgil:
Keith "ears for Vaal" Andes gets to know Miss Crump:
Scotty's girlfriend goes on a date with Goober...
...and Miss Lincoln avoids one.
I can't think of any two-for-ones, though.