3. 'The Leftovers' (HBO)
When it began in 2014, The Leftovers was a somber death trip – what happens to an American town after the Sudden Departure, when two per cent of the world's population disappears without a trace? But in its third and final season, this HBO drama took off into the stars, jumping across multiple timelines with interlocking stories, including a bizarre role for Mark Linn-Baker, playing himself as the hero of the long-forgotten Eighties sitcom Perfect Strangers. With Lost's Damon Lindelof taking off from Tom Perrota's novel, the story comes down to the bond between two people: Justin Theroux and Carrie Coon, as a couple of survivors struggling to let go of their past lives. (Coon pulled double duty this year with her head-turning performance as a cop on Fargo.) The finale was an unforgettable goodbye, right down to the last few seconds.