A crazed killer escapes from an asylum and assumes the identity of his twin brother, a famous and respected architect.
| Actor | Role |
|---|---|
 Donna MillsPatty Heron | Patty Heron |
 Ian HendryTerry Spelling / Bob Spelling | Terry Spelling / Bob Spelling |
 David LodgeBradley | Bradley |
 Roddy McMillanInspector Fillory | Inspector Fillory |
 Robin ParkinsonMr. Holland | Mr. Holland |
| SSusan DuryJenny | Jenny |
| CChristine ShawWoman | Woman |
 Seretta WilsonSara | Sara |
 James GreenePoliceman | Policeman |
| JJonathan DennisIntern | Intern |
| SSusannah MacMillanDorothy | Dorothy |
| RRalph BallDr. Styles | Dr. Styles |
| HHazel McBrideNurse | Nurse |
| JJohn SaundersMan | Man |