Andy Richter
Although it was hard to root for him as a fish-out-of-water accountant trying to establish himself as a private eye in Andy Barker, and it was hard to watch him play dad to five teenagers in Quintuplets, it was easy to see Richter as a kind of business-casual Buddha in this series. He seemed right at home as an office drone content in a mid-level job. And while Barker threw him into some crazy situations, they were nothing compared to the surreal scenarios he imagined for himself in Richter, like squeezing an old lady so hard that she turned into a diamond. Hopefully, we'll see more surreality like that in the sketches he'll be doing for Conan.

Paget Brewster
Although more people know her for her guest role on Friends and her current starring role on Criminal Minds, Paget Brewster was brilliant on this show as Andy's longtime friend who had recently been promoted to be his boss. She alternated between playing the superior who was giving Andy a dressing-down and the equal who wasn't afraid to throw hot coffee in Andy's eyes if he had wronged her in some way.

James Patrick Stuart
Stuart played Andy's attractive, confident friend Keith like some bizarre combination of Captain Awesome from Chuck and Barney Stinson from How I Met Your Mother. He was like the übermensch antithesis to Richter, with his square jaw and perfect hair -- endlessly polite, occasionally insensitive and egotistical, and always suited up. Nowadays you can see him in recurring roles on 90210 (as Charles Clark) and The Closer (as Deputy D.A. Garrett), but I'm willing to bet he's not as funny.

Irene Molloy
The least prolific actor in the cast, Molloy played the evil Becky on Grosse Pointe before doing ARCTU, and afterwards seemed to drop off the face of the earth. (Apparently, she started a band.) We're not too broken up about it. Her performance as Wendy, the office secretary and Keith's girlfriend, was serviceable and occasionally adorable, but far from inspired. Let's move on.

Jonathan Slavin
An amazing character actor, Slavin has played nerds and dweebs in great TV shows all around the dial -- My Name is Earl, Bones, Ugly Betty, Weeds, Life -- but we're probably the most excited to see him in Better Off Ted. His Ted character, a brilliant, needy scientist, is very much in line with his ARCTU character, a talented, needy artist. (In one episode, his character even dated Andy's grandmother.)

Conan O'Brien
The show had some great guest stars -- Jon Cryer, Cedric Yarborough -- but the greatest guest star by far was Richter's old boss, Conan O'Brien. Not coincidentally, he appeared in the greatest episode of the series playing Freddy Pickering, heir to the Pickering Industries empire, who befriends Andy and invites him to live the lifestyle of the rich and eccentric. When Andy's friends see that he's drifted apart from them -- spending too much time and money with Freddy, owning a pet leopard on a leash -- he invites them on a trip to Rio he and Freddy are going on. Of course, Freddy is planning on making one or all of them his "bride(s)," duct-taping himself to them and then throwing himself out of the plane. O'Brien delivers an alternatingly straight-faced and impish performance, and you never know what his character is thinking, which makes his outlandish behavior and the outlandish plot all the more delicious.

Pick up the complete series here, and share your favorite ARCTU memories below!