Ray Wise
The Twin Peaks alum first debuted in the season four episode, "The Devil Is In The Details...And The Upstairs Bedroom," as Father Peter Westley, a priest accused of murdering a supposedly possessed girl. He turns out to be innocent, which makes way for him to appear again in season five's Twin Peaks tribute episode, "Dual Spires," which also featured many other stars of the '90s cult drama. Wise then appeared again in the season eight remake episode, "Cloudy With a Chance of Improvement," as Judge Horace Leland.
Judd Nelson
Of all the '80s movies, there was one that Psych (and Shawn especially) obsessed over to the point of getting four of the five stars to guest star on the show. Judd Nelson was neither the first nor the last, but he still managed to make quite an impression as Dr. Steven Reidman from the CDC in the season four episode "Death Is In The Air." Nelson shared, "My experience on Psych was a blast. It didn't feel like work, but rather like actor camp. The entire cast, as well as the top-notch crew, was generous, enthusiastic and supportive. I wish I'd been able to do more than one episode."
Kristy Swanson
The original Buffy the Vampire Slayer first appeared, obviously, in the vampire-themed episode, "This Episode Sucks," from season six as Marlowe Viccellio. She was the girl who stole Detective Lassiter's cold heart—and almost stole his blood. Turned out, Lassiter's new lady love had been helping her brother steal and sell rare blood, and she was sent to jail. Despite her criminal record, Lassiter had fallen hard and over her six appearances throughout seasons six, seven, and eight, she was released from jail, married Lassiter, and eventually gave birth to his son in the back of a food truck. A happily ever after, for sure.
Tim Curry
We know, you've been shivering with antici...pation while waiting to get to this guest star. Obviously, we could never leave out Tim Curry. He basically played Psych's version of Simon Cowell in season two's "American Duos," which saw Shawn and Gus entering a singing competition to figure out who was trying to murder Curry's character, Nigel St. Nigel. We will probably never get the image of Tim Curry wearing Henry's little white robe out of our heads, but there are also much worse (better?) images of Tim Curry burned into our minds forever, so it's probably OK.
Kerry Washington
Before she was Olivia Pope, she was Mira Gaffney—Gus's secret wife! She starred in the season two episode, "There's Something About Mira," in which Gus and Shawn had to help find her new (and missing) fiance. While she was far less fashionable and much more fun than Olivia Pope has ever been, we are pretty sure Olivia could get behind Mira's choice for a wedding venue: a winery!
Cary Elwes
We really, really hope that when the Princess Bride star was asked to play the devilishly charming art thief Pierre Despereaux, his response was "As you wish." The beloved Dread Pirate Roberts played Shawn's idol and criminal mentor over four epic episodes between seasons four and eight. Elwes had nothing but good things to say about his experience working on the show: "Never have I had more fun working on a comedy series. Simply because that fun permeated the whole show season after season. So being able to portray 'Pierre' was an absolute joy for me, and on behalf of my very talented colleagues whom I had the great privilege of working with, our thanks to all the wonderful 'Psychos' out there who supported us for so long."