Mamma Mia

S3, E21: With encouragement from Liz (Tina Fey) and Tracy (Tracy Morgan), Jack (Alec Baldwin) begins a search for his real father. When Tracy introduces his newly discovered illegitimate son to his friends at "TGS," Liz and Pete (Scott Adsit) question the son’s intentions. Meanwhile, Jenna (Jane Krakowski) and Liz fight for the spotlight when Jenna gets recognition for one of Liz’s ideas. Also stars Jack McBrayer, Keith Powell and Katrina Bowden.