All the spoilers ahead.
"Close to the Metal" - Joe McMillan is positioned as the lead of "Halt and Catch Fire" in the first season, this Machiavellian asshole who will go to extreme lengths to get what he wants. Here, after a nail-biting episode where Cameron, Gordon, and finally Donna are all stretched to their limits to save accidentally deleted code, it's revealed that Joe engineered the whole crisis. It's a credit to the writers that you can look back on this episode and marvel at how far Joe is from this early version of himself by the end of the show. And maybe Boz too.
"Adventure" and "Landfall" - I think I like the first season of "Halt and Catch Fire" more than most, even though the characters were less developed, and it was following the template of other prestige AMC shows pretty closely. It managed to wring some great drama out of every step of the product development process, and the clash of big egos was always fun. "Adventure" is the episode where Joe and Gordon take separate tacks to salvage a deal for LCD screens, while Cameron gets to know Joe's awful father and get some insight into how Joe thinks. "Landfall," the next episode, is the one with the hurricane. Joe goes on a tragicomic quest for Cabbage Patch Dolls while Joe is trapped with Donna and the kids. Both are really about the characters slowly but surely learning to work in collaboration with each other.
"Up Helly Aa" - The trip to COMDEX is very eventful with the Cardiff team throwing an epic party, the Slingshot revealing what Donna's evil boss was up to, Joe saving the Giant by betraying Cameron, and finally the Apple Macintosh making its debut. I love the recreation of the 1983 convention, the last minute rush to the finish line, and the heartbreaking sacrifices that eke out a win at the last second. However, this is the episode that could serve as the show's logline. In spite of all their brilliance and all their best efforts, this is not the story of the ones who won the race.
"Kali" - Season two was a much slower and less structured year, putting all the characters in new places and letting all the different plot threads play out more gradually. This episode was the big climax, seeing Gordon hit a low point with his medical condition while Joe tries to give Cameron her due after Westgroup steals Mutiny's users. It's the culmination of Joe's whole season-long attempt to reinvent himself, only to keep falling into the same patterns of bad behavior. Cameron, of course, has her own plans in motion, which deliver some sorely needed comeuppance.
"And She Was" - The episode where Gordon and Cameron bond and play Super Mario together, while Donna is out of town. Despite their differences, the two most brilliant minds on the show really should be friends, and we finally get to see it happen at just the right moment to give Gordon somebody to confide in when he needs it most. This is also the episode where Joe loses control of MacMillan Utility, and uses one last card up his sleeve to burn everything down again. And it's also the beginning of the Mutiny IPO storyline that leads us right into…
"The Threshold" - This is one of the major turning points for the series, where Donna and Cameron's different approaches to the IPO blow up their partnership, and eventually the entire company after a dramatic meeting and confrontation. Cameron resorting to an ultimatum and discovering that nobody is on her side is devastating to watch. The irony is she's right, but her inability to compromise her plans and Donna's eroded trust means that there's no fixing the situation this time. We also finally see the other shoe drop in the Joe and Ryan story.
"NIM" - The show's biggest timeskip yet takes us to COMDEX in 1990, where Joe and Cameron reconnect, and it feels like there's a future for them together. Donna and Gordon have divorced, and Joanie is now a sullen teenager played by Kathryn Newton. The episode does a fantastic job of reorienting us to the new normal, setting up all the pieces for the next phase of the show and the next big idea. After four years some of the old animosities have gone away, but others remain. And some things will never change, like the printer bros.
"Who Needs a Guy" and "Goodwill" - These are arguably the show's finest hours. I've never seen any death on a television show handled as well as Gordon's, with the actual death heralded by these heartbreaking final hallucinations and then the immediate reactions of everyone else to the loss. The next episode has the main cast coming together to pack up Gordon's house, creating the opportunity to put everyone together to have uncomfortable conversations and reach some epiphanies. Donna and Cameron go a long way toward burying the hatchet, while Joe has to confront failure again as he and Haley search for a missing sweater. And Boz showing up with chili at the end is just perfect.
Honorable Mentions: "I/O," "1984," "Limbo," "Ten of Swords."
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