30 Rock: Season 3, Episode 3

3 - 3: The One with the Cast of 'Night Court'

Liz's former roommate from Chicago, Claire Harper (Jennifer Aniston), comes to visit her and Jenna. She develops a stalker-like obsession with Jack. Kenneth is unhappy with the new NBC page uniform so Tracy decides to cheer him up with the help of Night Court cast members Harry Anderson, Markie Post, and Charlie Robinson.