The film, which comes more than three years after the series finale in spring 2014, will air on USA network in December, reported Variety.
"Psych" creator Steve Franks will direct the movie, which he co-wrote with James Roday.
In the movie, fake psychic detective Shawn Spencer (Roday) and his best friend, Burton "Gus" Guster (Dule Hill), will team up once again.
Lassiter (Timothy Omundson), Juliet (Maggie Lawson), Henry (Corbin Bernsen) and Chief Vick (Kirsten Nelson) will also return for the movie.
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