Jessica Chastain plays a grown Beverly Marsh in the majority of the clip, which lasts almost three minutes.
Marsh can be seen returning to her hometown of Derry, Maine, where Pennywise terrorised her and her friends years prior.
Chastain's Marsh chats with a seemingly innocuous older woman who now lives in her childhood house – and turns out to be a much more terrifying entity.
James McAvoy, Bill Hader, Jay Ryan, Isaiah Mustafa, James Ransone and Andy Bean star as grown-up members of the Losers Club, formerly the group of children who confronted Pennywise in the 2017 film (and in Stephen King's original novel).
Bill Skarsgård, of course, reprises his role as Pennywise in the film, which is set 27 years after the events depicted in the first movie.
The 2017 cast are also back as the Losers Club's younger selves, meaning Finn Wolfhard, Jeremy Ray Taylor, Jaeden Chosen Jacobs, Jack Dylan Grazer and Wyatt Oleff are all set to return.
It Chapter Two will be released on 6 September 2019.
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