Lee Sizemore runs the Narrative Department at WestWorld. His story-lines consistently delight and/or terrify the guests; his temperament consistently grates on his colleagues.
During discussions with Dr. Ford and Bernard, he opposes the idea of making the Hosts more lifelike. He tells them: "But does anyone truly want that? Do you want to think that your husband is really fucking that beautiful girl or that you really just shot someone? This place works because the guests know the hosts aren't real."
Lee performs as he outlines his newest narrative, "Odyssey on Red River". He speaks about how wonderful it will be. Dr. Ford watches, as are Theresa and Bernard. Ford's reply to Lee's idea is simply "No, I don't think so." and he humiliates Sizemore in front of everyone.
Lee has taken "sick leave" after his "Odyssey on Red River" narrative is rejected. He's resigned himself to getting wasted while sitting poolside. Theresa attempts to bring him back to work after discovering Ford messing with the park, but Lee refuses, saying that he is one breakdown short of quitting. Theresa tells him that he can't quit and tells him to sober up and come in to work the next day. Lee instead meets an attractive woman who he tries and fails to flirt with. After having been cut off from the bar, Theresa's orders, Lee steals a bottle of alcohol and proceeds to piss all over the park operations control room. Amidst his antic, he is introduced to Charlotte Hale by Theresa Cullen, who turns out to be one of the Board members of Delos Destinations, Inc and the girl he was flirting with.
Charlotte interrupts Lee while he programs a host. He apologizes for their awkward first meeting, and says that he has heard about Theresa's death. Charlotte comments that her death is a loss to the company, and Lee states that there's a rumour going around that says Theresa wasn't the loyal worker everyone thinks. Charlotte defends her, saying that she died doing something important for the company, but refuses to answer Lee's questions about the nature of her work.
In his annoyance he boasts that Ford asked him to secretly program a villain for his new narrative, which Charlotte scoffs at, saying that he is only doing busy work. She tells him Ford would never trust him with a key character for one of his narratives, and offers him a job working with her.
That night the two make their way down to Cold Storage and look through the decommissioned Hosts. Charlotte selects Peter Abernathy, and reveals her plan to upload all the park's code onto his server, something that can only be done with a Host that has no stored information. She tells Lee to program Peter with a personality convincing enough that he can escape the park, and leaves him to it.
On the Monorail platform in Westworld Mesa Hub the hosts are lined up waiting, dressed in black. Lee Sizemore joins Charlotte Hale, who is watching from the floor above, and says Peter Abernathy is ready. He guesses that Ford is retiring that day and wants the job of Park Director. She promises him the job, says he can have it, do whatever he wants as long as he keeps it simple.
An announcer welcomes the Delos Board of Directors, they go down the escalator to greet the board.
Later, when Ford gives his speech at the gala, Lee and Charlotte watch from behind the audience; she sends him off to do "something important".
Lee later discovers that Cold Storage is now empty. He says that the story is for a new people and their choices.
Arrogant and egotistical, Lee has a desire to be the greatest and is deeply troubled whenever things don't go his way, as illustrated by his actions following Ford's rejection of his new narrative.
Lee looks up to Ford, and has great respect for him, getting excited when he thinks Ford wants his help programming a Host for him. Much to the dismay of Lee, Ford doesn't appear to think much of him, considering him unimaginative.