(there's probably a lot that I missed and there's a lot to add cause I'm only on season 11)

Tobin bell (season 1 ep 2)

Adam Scott (season 1 ep 20)

Lisa Edelstein ( season 4 ep 1)

Clea DuVall (season 3 ep 14)

Mariska Hargitay (season 4 for 13 episodes)

Dean Norris (season 5 ep 3)

Anna Gunn (season 5 ep 18)

Jared Padalecki (season 7 ep 10)

Aaron paul (season 9 ep 12)

Glenn howerton (season 10 for 6 episodes)

Rob McElhenney (season 10 ep 18)

Aisha hinds (season 10 ep 20)

Misha Collins (season 11 ep 16 & 17)