Colin Farrell and Brendan Gleeson head the billing for 'The Banshees of Inisherin', which also features a brilliant Irish cast in the film's first trailer.

In the film directed by Martin McDonagh ('Seven Psychopaths', 'In Bruges') Farrell and Gleeson star as as Pádraic and Colm, two long-time friends who come into conflict when one of them reveals he no longer wants them to be friends.

Barry Keoghan also stars as the local policeman's son. Joining him is Kerry Condon as Siobhán, Pádraic's sister. Pat Shortt and Gary Lydon also feature.

"The other night, you spent two hours talking to me about the things you found in your little donkey's shite that day," says Colm to Pádraic, who seems to dislike how "dull" his ex-friend is.

'The Banshees' was filmed on the west coast islands of Inishmore and Achill. The characters also speak in the western dialect of the time, something which McDonagh was aware might slip past some viewers from other countries.

"When I’m watching 'Mean Streets' or 'Goodfellas', I’m hearing 90% of it, he told Vanity Fair last week. "I’ll miss some Italian or New York dialogue, every couple of lines. But it doesn't matter. I’m going with it."

The accents are clear enough from the trailer, but it's weird to hear Dublin-born Farrell do a Western accent. He pulls it off to great effect however!

It goes without saying, but we're extremely excited for this one. Have a look at the trailer below.

'The Banshees of Inisherin' releases in theatres on October 21.