Sneak Peek: Halloween at 'The Office' and '30 Rock'

The characters from the two comedies celebrate the holiday by dressing up as someone or something famous.

Starting at 9/8c, it will be an hour of Halloween comedy on NBC this Thursday, October 29. "The Office" and "30 Rock" will lift the festivity as a theme for their respective episodes, "Koi Pond" and "Stone Mountain". As a preview, NBC has released clips where Darryl from "Office" arranges a haunted house event and Jack from "30 Rock" emphasizes how important the celebration is.

In "Koi", it's Halloween and the office plans a "Haunted House" for the children in the community. Creed dresses up as a vampire who sells blood, Andy as Michael Jackson and Meredith as a Hobo. And at an important business meeting, Michael falls into a koi pond. Meanwhile, Pam and Andy go cold calling to drum up more sales.

In "Mountain", Liz and Jack venture down south to Kenneth's hometown to discover new talent. Jenna tries to make friends with the writers to solidify her place at "TGS" before the new cast member is hired. Meanwhile, Tracy fears for his life when two celebrities die and he believes he's the next to bite the dust. Betty White and ventriloquist Jeff Dunham guest star.