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."

After self-medicating with Comanaprosil, Liz hallucinated that the "spunky tween" sitting next to her was actually the talk-show queen

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

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.

Jack's liberal congresswoman girlfriend missed a crucial vote on whale torture to frolic in a central Pennsylvania mining town.

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!"

The former veep was game to spoof his environmental advocacy on Rock's "Girlie Show".

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."

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.

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

The sitcom legend wisely allowed the 30 Rock stars to mock him relentlessly. Not that there's anything wrong with that.

Jack's Mommie Dearest made emotional terrorism an art form.

Just as Liz found love with normal guy Floyd, he promptly moved to Cleveland.

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.

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.").