AVClub: Billions has been the C-plus student of premium cable dramas for most of its debut season, too dull to be engaging but too well-crafted to disregard. And just under the wire, here comes “The Conversation.” The season finale is so far above anything else Billions has done, the temptation is to ask “Where did this episode come from?” But the answer is simple and unsatisfying. “The Conversation” is the culmination of everything that preceded it, an elegant patchwork of tiny plot points and character details littered across the season. It is the whole that somehow equals more than the sum of its parts. Even threads I distinctly remember being annoyed with, like Tara’s double-agent routine or Bryan’s friendship with Orrin, suddenly feel like they might have been worth my investment.