Psychoville returns with a spooktacular hour-long Halloween special. Four tales of terror unfold as location manager Phil Walker investigates the abandoned ruins of Ravenhill Psychiatric hospital. Does the ghost of evil governess Edwina Kenchington still walk the empty corridors? What other horrors lie within these crumbling walls?
| Actor | Role |
|---|---|
 Reece ShearsmithVarious | Various |
 Steve PembertonVarious | Various |
 Matthew FentonYoung Drew | Young Drew |
 Eileen AtkinsNurse Edwina Kenchington | Nurse Edwina Kenchington |
 Alex WaldmannOlder Drew | Older Drew |
| MMaisie HopkinsCat | Cat |
| BBethany McCannGhost | Ghost |
| BBilly HollandDevil | Devil |
 Josie WalkerJanet | Janet |
 Dawn FrenchJoy Aston | Joy Aston |
| EEmily WachterProspective Buyer | Prospective Buyer |
 Daniel KaluuyaTealeaf | Tealeaf |
 Julian BleachDoctor/Eddie | Doctor/Eddie |
 Daphne CheungSue | Sue |
 Nicholas SidiAdrian | Adrian |
 Angela SimsLiz | Liz |
 Imelda StauntonGrace Andrews | Grace Andrews |
 Daniel IngsKelvin | Kelvin |