Everything to Remember Ahead of 'Unforgotten' Season 6

One of PBS Masterpiece's most successful series, Unforgotten, was initially commissioned by ITV in 2014 as a joint project from screenwriter Chris Lang (I, Jack Wright) and director Andy Wilson (Ripper Street). The first season aired in October 2015, and Season 2 in 2017, earning BAFTA nominations and securing distribution on PBS. Seasons 1 and 2 as a set, airing them as six feature-length episodes in 2018 and introducing audiences to DCI Cassie Stuart (Nicola Walker), who had just taken over a new division dedicated to bringing justice to cold cases with her new bagman, DS Sunil "Sunny" Khan (comedian Sanjeev Bhaskar in a rare serious role),

Season 1's "The Case of Jimmy Sullivan" featured the teenager's skeleton in the foundations of the former Arlingham House, dated to the early 1970s, when his mother, Maureen (Frances Tomelty), lost track of him. Cassie identified four suspects: Father Rob Greaves (Bernard Hill), Lizzie Wilton (Ruth Sheen), Sir Phillip Cross (Trevor Eve), and Eric Slater (Tom Courtenay).

Greaves, the pastor, was sleeping with an underage girl. Lizzie, a skinhead's girlfriend, liked Jimmy but was pressured to beat him up. Cross, now a politician, was a gangster's heavy to whom Jimmy was in debt. Eric, a paraplegic since an 80s car crash, with a wife, Claire, suffering from dementia, was the former bookkeeper.