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Meet the motley crew who joined Tina Fey and Co on the set

Shaun Harrison
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1 of 15 Nicole Rivelli/NBC

Jennifer Aniston as Claire

Rachel who? Aniston played an erratic friend of Liz's from Chicago who couldn't keep her paws off of Jack. We particularly loved how she referred to their romps as "riding the F train."
2 of 15 Nicole Rivelli/NBC

Oprah Winfrey as Herself/Pam

After self-medicating with Comanaprosil, Liz hallucinated that the "spunky tween" sitting next to her was actually the talk-show queen
3 of 15 Nicole Rivelli/NBC

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Megan Mullally as Bev Mullally played a buttoned-up adoption counselor whose visit to Liz's office ended disastrously
4 of 15 NBC Universal

Will Arnett as Devon Banks

Jack's sexually confused adversary for the top job at NBC — and in "talking-like-this" contests — wore a short-short robe when he seduced Kenneth. That's all you really need to know.
5 of 15 Nicole Rivelli/NBC

Edie Falco as Celeste "C.C." Cunningham

Jack's liberal congresswoman girlfriend missed a crucial vote on whale torture to frolic in a central Pennsylvania mining town.
6 of 15 Anne Joyce/NBC

Carrie Fisher as Rosemary

Liz's comic idol — and metaphor for Future Liz — turned out to be a little nuts. As the erstwhile Princess Leia put it: "Help me, Liz Lemon. You're my only hope!"
7 of 15 Kent Eanes/NBC

Al Gore as Himself

The former veep was game to spoof his environmental advocacy on Rock's "Girlie Show".
8 of 15 Nicole Rivelli/NBC

Buck Henry as Dick Lemon

As Liz's dad, comic legend Henry (center) spoke the oft-repeated — and misunderstood — line: "You can't have a Lemon party without old Dick."
9 of 15 Virginia Sherwood/NBC

Chris Parnell as Dr. Leo Spaceman

The SNL vet recurs as a quack who recommends that Jenna try crystal meth to lose weight and that Tracy try to enjoy the various drug interactions of his prescriptions.
10 of 15 Kent Eanes/NBC

David Schwimmer as Greenzo

As Al Gore's environmental mascot, David Schwimmer went from cheery actor to drunken lout in the space of 22 minutes.
11 of 15 Chris Haston/NBC

Jerry Seinfeld as Himself

The sitcom legend wisely allowed the 30 Rock stars to mock him relentlessly. Not that there's anything wrong with that.
12 of 15 Nicole Rivelli/NBC

Elaine Stritch as Colleen Donaghy

Jack's Mommie Dearest made emotional terrorism an art form.
13 of 15 Virginia Sherwood/NBC

Jason Sudeikis as Floyd

Just as Liz found love with normal guy Floyd, he promptly moved to Cleveland.
14 of 15 Nicole Rivelli/NBC

Rip Torn as Don Geiss

Come on, it's Rip Torn! Plus, we loved watching Jack trip all over himself while trying to earn the job of the lame-duck NBC president on his way out.
15 of 15 Nicole Rivelli/NBC

Dean Winters as Dennis Duffy

Everyone's favorite beeper salesman reunites briefly with Liz — that is, until he appears on To Catch a Predator ("She said she was 16, but I knew she was 22.").