30 Rock Season 3 Episode 16 (03/26/09)
Dennis Duffy is back, as is the lack of chemistry he and Liz Lemon have.
Recently self-diagnosed as a sex addict, he made his way to Liz's apartment to work on his steps and atone. What a great show this is.
One problem: Dennis has also slept with Jenna, as Liz discovers when she answers Jenna's phone and Dennis gives exactly the same speech.
Liz vows not to let it affect their friendship, but watching her do a slow boil when she and Jenna confront Dennis and they explain what happened.
Of course, Liz does let him get the better of her later, when she sees Jenna's rig for a Peter Pan sketch isn't set and lets Jenna fall
Today is also Jack's birthday. He's turning 50 and planning a big gala to celebrate how much he's accomplished since making a list in fifth grade of the things he wanted to do by 50.
But a bunch of old home movies his mom sent to him have made him wistful for a time when a present made him so happy he threw up.
He's determined to get that feeling again, despite Liz's warnings that he can't recapture his childhood.
Feeling bad about letting Jenna fall, Liz makes amends by letting her show the writers the one commercial she booked during her brief time as an actress - for a phone sex line in Chicago (1-900-OKFACE).