It’s A Sin is the hotly-anticipated five-part series from Russell T Davies (Picture: Channel 4)

Russell T Davies’ hotly-anticipated Channel 4 drama It’s A Sin begins tonight, kick-starting our new Friday night obsession.

The five-part series, starring Olly Alexander and Neil Patrick Harris, follows the lives of three young men who together endure the horror of the HIV/Aids epidemic of the 80s as well as the pain of rejection and the prejudices that gay men faced throughout the decade.

Here’s everything you need to know about when It’s A Sin will air and who is in the cast.

When is It’s A Sin on Channel 4 and who is in the cast?

It’s A Sin will launch on Friday, January 22 at 9pm on Channel 4, with new episodes airing weekly.

The entire series will also be available to stream on All 4.

Olly Alexander as Ritchie Tozer

Olly Alexander plays Ritchie (Picture: Getty/Channel 4)

Years and Years singer Olly Alexander plays Richie Tozer, an 18-year-old who is the golden boy of a middle-class family from the Isle of Wight.

His family don’t know that he’s gay, but when Ritchie hits London, and freedom, his life explodes in all sorts of directions.