Jim asks MacKenzie why she's "afraid to see Will." That gets this ridiculous line in response, delivered awkwardly by Emily Mortimer who, for all her talents, just can't pull it off, especially with the English accent: "Hey, Jughead, I ain't afraid of nothing except jellyfish, which is completely normal. Now, look at the girl!" Jim asks MacKenzie what's in this for her, and it turns out quite a bit: MacKenzie thinks she needs Don on her staff, and if he feels threatened by Jim, he'll try to impress Maggie by staying. Which I think we can all assume MacKenzie is correct about since Don is in the opening credits. Jim tries to take a hard line with MacKenzie, refusing to work on the show if she doesn't tell him what's up with her and Will. "I can't," MacKenzie says. Jim gives in anyway. MacKenzie says they'll do the best news ever together on Will's show. "Where's the rest of the staff?" Jim asks. "They left!" MacKenzie says. She's so happy to possibly screw Jim over and ruin his career, isn't she?
And now, Will returns to the office to come face-to-face with MacKenzie. She tries to be cordial, but Will cuts her off and angrily orders her into his office. Maggie tries to be a good intern/assistant/associate producer by offering to get Will coffee, but he refuses. After an awkward silence in his office, MacKenzie says she tried to talk to Will in the three years since whatever went down between them, but he angrily says he didn't even read her emails. Then he lights a cigarette because Sorkin is pushing boundaries with his TV shows right here by having his characters smoke on the air. MacKenzie can't help but ask Will a personal question even though this is clearly not the right time or place or person for it, wondering if he was with Erin Andrews in St. Lucia. She takes the question back before he can refuse to answer it.
Will informs MacKenzie that the three-year contract she thought she had is no more. Instead, he will have the ability to fire her at the end of every week and plans to give her a few months of work before he does so to avoid raising eyebrows. Will was able to change MacKenzie's contract by taking a million-dollar annual paycut. That's how much he loves power and hates MacKenzie, I guess.
So while they're fighting in Will's office, Don and the rest of the pizza party return to do some actual work. Maggie introduces Don to Jim, and, since they've both worked under MacKenzie, they compare notes on how crazy she is and how much she loves America, if only to explain how MacKenzie has an English accent but is American. She was born in America to British parents, who lived in the US while her father was Margaret Thatcher's ambassador to the United Nations. So ... she was born in America while her father worked for Thatcher, who was Prime Minister from 1979 to 1990, which makes MacKenzie 33 years old, at the most? Thirty-one, actually, once you realize that - spoiler alert! - this episode takes place two years ago. Yet Emily Mortimer is 40 years old. Would it have been so difficult to avoid this whole thing entirely by just having her do an American accent, which she's done very well in previous roles? She probably would be able to deliver some of those lines, too.