“I’ve just taken a cyanide pill,” Siggi Wilzig (Michael Emerson) admits in episode 2 of Prime Video’s Fallout series. “Vault-Tec Plan D: It was the most humane product that Vault-Tec ever made.” This thought sets up viewer expectations for what’s to come over the next few episodes — but for fans of the post-apocalyptic video game series, it’s a glib reminder of the fictional corporation’s heinous in-game history. Vault-Tec built the bomb shelters, or Vaults, in the world of Fallout, purportedly as a cautionary measure to protect the American people in the event of a catastrophic incident. Funded by the...