"Life on Mars" is a BBC drama about a modern-day Manchester detective who is knocked unconscious by a car and wakes up in 1973. Sam Tyler (John Simm) then finds himself working in a police station and he doesn't know whether he's asleep, dead or in a coma. Throughout the series his underlying ambition is to find a way to get home, but for the most part the show acts like a conventional police drama set in the political incorrect 1970s. Tyler constantly finds himself at odds with his new colleagues. DCI Gene Hunt (Philip Glenister) is an old-style cop who is not afraid to throw a few punches to get a result; DC Chris Skelton (Marshall Lancaster) is a cheeky but likeable character who finds himself torn between modern Sam and old fashioned Gene; DS Ray Carling (Dean Andrews) is pure old school and often goes with his gut instinct; and WPC Annie Cartwright (Liz White) is the token female and she is often undermined and taken for granted. Tyler's frustrations also include no longer being able call upon cutting edge forensics and an array of specialists to aid an investigation. In the opening episode, Sam's dogged pursuit of evidence brings him head to head with Gene when the team arrests an elusive criminal high on the CID's wanted list. The critically acclaimed drama premiered on BBC One in 2006 and ran for two series. The time travelling premise was furthered explored in spin-off series "Ashes to Ashes".