He may portray a crime-solver on Psych… But in December, James Roday will be a crime-solving singer and dancer.

USA Network has announced that the long-awaited, two-hour Psych musical episode will be broadcast on Sunday, December 15 with guest appearances by musical veterans Anthony Rapp and Barry Bostwick.

In the sneak-peek at the musical episode, via The Hollywood Reporter, the 37-year-old Mexican American actor’s character Shawn and Dule Hill‘s Gus sing and dance about solving cases under the Santa Barbara sky, joined by other members of the Santa Barbara Police Department.

In Psych: The Musical, Shawn and Gus track down escaped playwright mad man named Z (Rapp), who six years earlier was deemed criminally insane after locking a critic in a back room of the theater that he burned to the ground. Shawn and Gus are forced to consult with the one person Z confided in while in the institution, a dangerous villain from Shawn’s past.

Meanwhile, USA has announced the winner of the first ever Psych fan-vote contest to choose a storyline to feature in a season eight episode.

The chosen episode, “A Nightmare on State Street”, will find Gus entering dream therapy to understand the cause of his recent night terrors, but after therapy, nothing is as it seems. It will be directed by Roday and promises to deliver “a new vision in terror.”

The eighth season and final of Psych will premiere this winter on USA Network.