Liz Lemon's secret is about to be uncovered on "30 Rock", so it is promised in a promo for the sixth season of comedy series. The video mostly highlights how Tracy Jordan, Jack Donaghy and more people around Liz are curious to find out what she's hiding. The sneak peek, however, still manages to give a glimpse at Kelsey Grammer's guest-starring appearance.
In the upcoming season of the show, Grammer will return to play himself. This time, he is involved in a much bigger scam as he revealed, "It's the first time in history I pull a guy's pants off."
"30 Rock" will return with the new season on Thursday, January 12, 2012 on NBC. Other actors set to guest star are James Marsden, Kristen Schall, Mick Foley and Mary Steenburgen.