30 Rock
Liz Lemon, the head writer for a late-night TV variety show in New York, tries to juggle all the egos around her while chasing her own dream.

Season 3 · Episode 21 ·
Mamma Mia
Liz and Tracy encourage Jack to search for his real father. Tracy meets his new found illegitimate son, but Liz and Pete question the son's intentions. Jenna takes the credit for one of Liz's ideas.
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Episode 21 of season 3 of 30 Rock: “Mamma Mia”. Aired 2009-05-07. Watch it online free on ZapFlix.