Ken Lynch (again!) as a studio executive in That Girl’s “7 1/4.”
Stanley Adams (again!) as “Sheriff Tate” in Bonanza’s “The Pure Truth.”
I’m not sure this counts, but I began this thread about a hundred years ago, so:
Janos Prohaska wore the horta suit in “Devil in the Dark”, and wore a chimpanzee suit in the Outer Limits episode, “The Sixth Finger”.
Vic Tayback (“JoJo Krakow” in “A Piece of the Action”) as a mover in today’s episode of That Girl.
Bill Quinn (“McCoy, Sr”) as a priest in today’s episode of That Girl.
Arthur “Lt D’Amato” Batanides as “Bernard the Gangster” in the “Big Max Calvada” episode of The Dick Van Dyke Show.
Michael “Apollo” Forest as a Catholic priest in the Dick Van Dyke episode “The Life and Love of Joe Coogan.”
Christopher Plummer plays a crusty old Swedish tycoon in The Girl with the Dragon Tattoo.
I had no idea that was Plummer.
As a Swede or as a Klingon?
As Chang. Swedes don’t have that forehead problem.
“Problem”?
Er, Swedes don’t have such attractive foreheads as Klingons do.
Better. 
'IwlIj jachjaj
nuH 'oH baHlu’chugh
A double baHl’chugh on you!
jIQuchqu’mo’ loDnI’wI’
I saw Bill Quinn again in the episode of That Girl where the rock band hired to play at her father’s restaurant stripped at the end of their set.
Hey, it was the '60s! (And Ann and Donald never got it on once in five years… 
)
Just saw Alan Ruck as a clueless Walgreens exec in The Dropout, a movie about the Theranos corporate scandal.
Also saw Jason Isaacs as a prickly British admiral in the WWII espionage drama Operation Mincemeat.
Colm Meaney of Deep Space Nine, in Stargate Atlantis, “Underground”.