Zachary Levi was later announced for the film as the main villain, "Thin White Duke",[7] while Jazmyn Simon – Dulé Hill's real-life fiancée – played Selene, a romantic interest for Gus.

[9] On June 28, 2017, former guest star Ralph Macchio joined the cast reprising his role as Nick Conforth,[10] the police academy officer who trained Shawn and Gus in season 5.

[13] In addition, Kurt Fuller, John Cena and Jimmi Simpson were confirmed to be reprising their respective roles of Woody Strode, Ewan O'Hara and Mary Lightly.

[14] On April 18, 2019, it was announced Joel McHale would be joining the film, as well as Jimmi Simpson, reprising his recurring role as Mary Lightly.

[15] On September 17, 2019, it was announced that the sequel had been renamed Psych 2: Lassie Come Home and would instead be airing on NBCUniversal's new streaming service, Peacock.