Ep 7. Mazel Tov, Dummies!

In "Mazel Tov, Dummies!" the seventh episode of the seventh season of 30 Rock, the cast and crew of the fictional sketch comedy show, TGS with Tracy Jordan, attend the wedding of Liz Lemon's ex-boyfriend, Dennis Duffy, and his pregnant fiancé, Megan.

The episode begins with Liz (Tina Fey) trying to avoid attending the wedding by pretending to have plans to visit her boyfriend, Criss (James Marsden), at his off-the-grid cabin. However, her plans fall through and she is forced to attend the wedding. Meanwhile, Tracy Jordan (Tracy Morgan) plans to use the wedding as a platform to propose to his wife, Angie (Sherri Shepherd), for the second time.

At the wedding, tensions rise when Dennis (Dean Winters) reveals that he has written a tell-all book about his relationship with Liz, sparking a rift between the two former lovers. The book also details Dennis' former career as a male prostitute, causing Liz's co-worker, Jenna Maroney (Jane Krakowski), to question her own past relationships.

As the wedding festivities continue, Liz, upon seeing how happy Dennis is with his new fiancé, comes to the realization that she may not be ready for marriage. Meanwhile, Tracy's proposal plans are thwarted when Angie reveals that she has her own surprise for him.

The episode ends with Liz having a heart-to-heart with Dennis, assuring him that she is happy for him and his new life. Tracy and Angie also come to a resolution, reaffirming their love for each other.

Overall, "Mazel Tov, Dummies!" offers a comedic and heartfelt exploration of marriage, relationships, and the complexities of the past. The episode features standout performances from Fey, Morgan, and Shepherd, and offers a satisfying conclusion to Dennis' arc on the show.