It's a Sin is a British television drama miniseries written and created by Russell T Davies and developed by Red Production Company. The five-part series is set from 1981 to 1991 in London. It depicts the lives of a group of gay men and their friends who lived during the HIV/AIDS crisis in the United Kingdom. It's a Sin features a main cast consisting of Olly Alexander as Ritchie Tozer, Omari Douglas as Roscoe Babatunde and Callum Scott Howells as Colin Morris-Jones, who all move to London. Lydia West, Nathaniel Curtis and David Carlyle play the characters of Jill Baxter, Ash Mukherjee and Gregory Finch respectively. Together they form the ensemble which the show focuses on most. Other actors cast were Keeley Hawes, Shaun Dooley, Tracy Ann Oberman, Neil Patrick Harris and Stephen Fry. It premiered in the United Kingdom on Channel 4 on 22 January 2021.