s5e11 "Time Unknown"

 

That's Eddie fucking Murphy!

s03e12 "Fire Walk"

 

That's Vincent Schiavelli from Ghost!

s02e11 "50 Paces"

 

That's Kelsey Grammer!

s4e2 "Trial and Error"

Leland Palmer/ Shrim

UPDATE: Looks like Ray Wise made another appearance, on Voyager:

s03e13 "The Hidden Pony"

 

That's Dense L. Washington! 

s05e12 "Rocket Fuel"

That's Wayne Newman!

s01e21 "Picture Perfect"

That's Daniel Day Lewis!

s02e04 "Curiosity"

That's Christian Bale!

s03e19 "The Flute"

 

That's Bill Lumberg!

 

s04e24 "The Cold"

 

That's Shooter McGavin!

s7e10 “bad holodeck”

 

Ensign Ro Laren, that’s Julie from Zeinfeldt!

s03 e21 "Pratfall"

 

That's Bebe Neuwirth!