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Psych Exclusive: Bunheads' Sutton Foster Joins Fan-Chosen Finale -- Plus More Casting Scoop

Psych Cast Sutton FosterFormer Bunhead Sutton Foster will let her hair down — and scare up some fun — in Psych‘s nightmare-ish Season 8 finale.

TVLine has learned exclusively that Foster has landed a role in the USA Network comedy’s James Roday-penned installment, titled on “A Nightmare on State Street.”

Described as “a new vision in terror,” the episode — the storyline of which was decided upon by fans via an online poll — follows a sleep-deprived Gus into dream therapy as he attempts to get to the bottom of recent night terrors. After his treatment, however, nothing is what it seems, and he soon learns that “in dreams, no one can hear you scream!”

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Foster guest-stars as a sweet middle school teacher who might be having a fling with a gym teacher (played by Billy Zabka, who most recently appeared on How I Met Your Mother).

Psych Cast WWE Bella TwinsTVLine has also learned that WWE Divas/Total Divas stars Brie and Nikki Bella aka The Bella Twins will appear in the same episode as “sinister, double-dutching, demonically sexy” sisters who equal parts terrify and tantalize Gus.

The star-filled season-ending episode features Burn Notice fave Bruce Campbell as Gus’ dream therapist, Dean Cameron (Men at Work) and a slew of returning guest stars, including Phylicia Rashad (The Cosby Show), who’ll reprise her role as Gus’ mother, Kurt Fuller (Better With You), back as the Santa Barbara Police Department’s kooky coroner and Tears for Fears rocker Curt Smith.

As previously reported, Mira Sorvino will also take part in the hour (as well as a handful of episodes leading up to it), playing the SBPD’s new badass head detective.