For the first time, Netflix ‘s Black Mirror has made a follow-up to one of its previous episodes, and to close out the long-awaited return of the show is the sequel to fan-favorite “USS Callister: Into Infinity.” According to the episode logline, “Robert Daly (Jesse Plemons) is dead, but the crew of the USS Callister — led by Captain Nanette Cole ( Cristin Milioti ) — find that their problems are just beginning.” Among the many problems that the titular crew faces is that they can now die. Even worse, there’s a massive target on their backs because they steal credits from other players to survive. Viewers also learn that Michaela Coel’s character, Shania, from the original episode, was killed four weeks ago, something that Captain Nanette reveals, noting that she’s haunted by it. What’s taking place in the real world? While Nanette’s clone is aboard the USS Callister, the version of her that’s “out there” is investigating complaints from online gamers who’ve reported an unknown...