He may not be a household name, but Michael Emerson became a household face by virtue of his role as the sinister Benjamin Linus in Lost, the leader of the group called the Others on the show’s hallucinatory South Pacific island. Emerson, born in Cedar Rapids, Iowa in 1954, was already a theatre veteran with a string of intermittent TV performances to his credit. Now his ascent became rocket-assisted as he appeared in all of Lost's six seasons except the first, winning an Outstanding Supporting Actor Emmy in 2009. 

Last week we left Homer Jackson, the raffish ex-Pinkerton detective with the exceedingly chequered past, languishing in jail, after being fitted up for a Ripper-style killing by the murderous Frank Goodnight (played by cultish US actor Edoardo Ballerini). For this week's finale, Matthew Macfadyen's DI Reid urgently needed to get Jackson out again in order to apply his advanced forensic skills to unravelling a white slaving racket.

Perpetually reborn in movies and TV series, Jack the Ripper rides again in Ripper Street, which is set in Whitechapel in 1889, in the aftermath of the much-mythologised murders. Except this time, the subject isn't the Ripper himself so much as the dread and hysteria he left in his wake, which shrouds the murky streets like poison gas.

Far be it from me to try to impose shape or meaning on the past 12 months of television. You'd need teams of statisticians and psephologists to have any chance of drawing conclusions from the whirling cosmos of TV, and its infinite variety of soaps, shopping, repeats, weird sports, ailing current affairs programmes, forgotten comedies and obscure dramas. Instead, in a spirit of shameless subjectivity, here are 10 of my favourite performances from 2012.

William Boyd wrote the screenplay for this adaptation of his 2006 espionage novel, and since it’s integral to the whole he retained its two-part structure. The first concerns the World War II activities of former British intelligence spy Eva Delectorskaya, the second, set in 1976, concerns her efforts to lay the past to rest. Not only has the past cast a dark shadow over her life but it continues to endanger it. For this she enlists the help of her daughter.

Pantomime is one of the great festive traditions and the version of Dick Whittington envisaged by John Bishop in this one-off comedy drama checked off every single one of the clichés. Taking a writer’s credit alongside Jonathan Harvey of Gimme Gimme Gimme fame, the Liverpool comic drew on his experiences on regional stages near the beginning of his showbiz career in pulling together the script.

The uproarious success of Downton Abbey, now firmly established as one of Britain's great national pastimes, seems to have had the happy effect of persuading ITV1 that it must make more drama. Thus, the autumn of 2012 has been ushered in by new ITV dramas swirling about our ears like tumbling leaves, from The Last Weekend and The Scapegoat to the comeback of Downton itself.

At the end of episode four, we left ferret-faced copper Steve Arnott (Martin Compston) seemingly having his fingers hacked off with a bolt-cutter by a gang of hooded thugs and their poisonous little child-sidekick, Ryan. Boringly, the glum and dislikeable Arnott was rescued in this finale when the supposedly corrupt DCI Gates organised a police rescue, and got away with all his fingers mostly intact.

Those quaint old TV shows in which we were invited to support and admire the police unreservedly have long been overtaken by real-life events. Now evolution has brought us to Line of Duty, a series that presents the police as a failing bureaucracy hamstrung by paperwork and political correctness. From what one gathers of how our contemporary rozzers operate - inviting you to report crimes by email, for instance, because police stations are only open some of the time, or arresting victims instead of perpetrators - this may be unpleasantly close to reality.

And so Desperate Housewives has ended after eight funny and entertaining seasons. Marc Cherry's creation, which first went on air in October 2004, deservedly won numerous Emmys and Golden Globes along the way. It was set in the small town of Fairview in the fictional Eagle State and followed the lives of four neighbours on the same street - Susan (Teri Hatcher), Bree (Marcia Cross), Lynette (Felicity Huffman) and Gaby (Eva Longoria).