Check out a first look at 30 Rock Season 4 Episode 2 "Into the Crevasse" airing this Thursday October 22 at 8pm on NBC.
Episode Synopsis: When Devin (guest star Will Arnett) returns to plot revenge against Jack (Alec Baldwin), he needs to find a way to protect the company and his job's safety. Meanwhile, Tracy (Tracy Morgan) and Jenna (Jane Krakowski) both have reason to be angry with Liz (Tina Fey) and are determined to make her life miserable. Liz has to find a way to regain order over her life and the show. Outside of the studio, Kenneth (Jack McBrayer) devotes some of his spare time to volunteering at an animal shelter. Judah Friedlander and Keith Powell also star.