From NBC's official press release:

Why is Tracy (Tracy Morgan) causing city-wide mayhem?  Will Jack (Alex Baldwin) and Elisa (Salma Hayek) take the next big step in their relationship?  Find out when Salma Hayek, Larry King and Meredith Vieira guest star.

Jack (Baldwin) considers taking the next step with Elisa (Hayek), but will he be able to choose between his commitment to her and his demanding career? Meanwhile, Tracy's (Morgan) interview on "Larry King Live" sends New York City into a panic. Out in the chaotic city, Liz Lemon (Tina Fey) recruits Kenneth (Jack McBrayer) to venture out to Queens to retrieve her lost cell phone from a surly cabbie.

30 Rock also stars Jane Krakowski, Judah Friedlander and Scott Adsit.


Source: NBC
(Image courtesy of NBC)