You better not be scared of clowns because IT's coming to cinemas. Based on Stephen King's novel of the same name, the film follows a group of children called The Losers Club taking on the evil force beneath their town who typically manifests as a psychotic clown you definitely wouldn't book for your kid's birthday.

Despite being an R-rated horror film, the cast is mostly made up of child actors, although you'll recognize many of them from the likes of Stranger Things, Guardians of the Galaxy and more. Here's a rundown of the cast, as well as where you might have seen them before.

Bill Skarsgård As Pennywise

Bill Skarsgard and Pennywise

Son of Stellan (Erik Selvig in the Thor movies) and brother to Alex (True Blood and The Legend of Tarzan), Bill takes over the demonic clown Pennywise from Tim Curry. IT is sure to be his breakout role but you may have previously seen him in Hemlock Grove and Allegiant.

Related: Tim Curry is ‘Fascinated’ By The New Version of Pennywise

Where You Might Have Seen The Losers Before

From left to right:

Chosen Jacobs - Mike Hanlon A couple of years older than his co-stars, Jacobs has only got a handful of credits to his name, most prominently Will Grover in Hawaii Five-0.

Finn Wolfhard - Richie Tozer The most famous of the child actors, Wolfhard grew to prominence as the lead of Netflix's Stranger Things (which returns for Season 2 at the end of October). In IT he's the bespectacled Richie Tozer, who was played as a child in the 1990 TV miniseries by Seth Green.

Sophia Willis - Beverly Marsh With just a few appearances in short films and small features, IT is Willis' first major film.

Jaeden Lieberher - Bill Denbrough The leader of The Losers Club, Bill Denbrough is played veteran child actor Jaeden Lieberher. He's been very prominent in recent years, starring alongside Bill Murray in St Vincent and Michael Shannon in Midnight Special, as well as this year's Book of Henry.

Jack Dylan Grazer - Eddie Kaspbrak Playing the group's hypochondriac is Jack Grazer. He will also play a young Bobby Moynihan (SNL) in upcoming CBS sitcom Me, Myself & I.

Wyatt Oleff - Stanley Uris Uris has had several small roles in TV shows, although you'll probably recognize him as the young Peter Quill from the opening of Guardians of the Galaxy.

Jeremy Ray Taylor - Ben Hanscom Taylor has starred in an impressive list of films for someone his age - Ant-Man, Alvin and the Chipmunks, 42 - but they've all been bit-parts.

Related: IT Cast Imagines Which Adult Actors Would Play Them In Part 2

Who Else Is In IT?

IT Supporting Cast

Nicholas Hamilton - Henry Bowers The leader of the gang who bully the losers is played by Nicholas Hamilton, who just last month was the bully in another Stephen King adaptation, The Dark Tower. He also played one of Viggo Mortensen's free-spirited children in Captain Fantastic.

Jackson Robert Scott - Georgie Denbrough The unlucky-turned-terrifying Georgie is Scott's very first movie (although he did have a small role in Fear The Walking Dead as a young Troy Otto).

Owen Teague - Patrick Hockstetter Derry's resident animal carcass collecting psycho may be recognizable to Bloodline fans, in which Owen Teague plays Nolan Rayburn. He'll be next seen in the first episode of Black Mirror Season 4.

Javier Botet - The Leper You may not recognize him, but the creepy Leper is played by a horror vet - Javier Botet has appeared in [REC], The Mummy, The Conjuring 2 (as the Crooked Man), the titular Mama in IT director Andy Muschietti's previous film and even did uncredited work on the xenomorph for Alien: Covenant. Next year he'll be adding another icon in the form of Slenderman.

Megan Charpentier - Greta Bowie The snobby kid in the Losers' class was previously seen as The Red Queen in Resident Evil: Retribution and the lead of Mama.

Steven Williams - Leroy Hanlon A prominent 80s/90s actor (making his casting rather fiting), Williams had recurring roles in The X-Files, The Equalizer, 21 Jump Street, and more recently Supernatural and The Leftovers.

Stephen Bogaert - Al Marsh Beverly's abusive Dad has a string of notable roles, most prominently Harold Carnes in American Psycho but also a brief appearance in X-Men: Apocalypse.

Ari Cohen - Rabbi Uris Stanley Uris's father is an actor with dozens of credits, mainly on Canadian TV.

Next: IT Review

Key Release Dates