Dr Max Harrow is awakened from a re-current nightmare in which he is pursued by a barbaric accusing figures, to find a tramp collapsed on his doorstep, The tramp is suffering from a genetic radiation disorder that should killed him in infancy as it did Harrow's baby son. The man is the living image of Harrow's nightmare figures, Clutched in his hand is a human finger bone and he speaks a strange, unknown tongue,
| Actor | Role |
|---|---|
 Ronald LewisDr. Max Harrow | Dr. Max Harrow |
 John GabrielSmiffershon | Smiffershon |
 Jane DownsDiana Harrow | Diana Harrow |
| RRichard GaleDr. Gordon Faulkner | Dr. Gordon Faulkner |
| DDelena KiddDr. Laura Denville | Dr. Laura Denville |
 Moultrie KelsallProf. Leach | Prof. Leach |
 George WoodbridgeDet. Sgt. Cloudby | Det. Sgt. Cloudby |
 Peter BowlesPoliceman | Policeman |
| BBlake ButlerAnderson | Anderson |
| LLaidlaw DallingRadiographer | Radiographer |
| BBridget McConnellSister | Sister |
| MMaitland MossHead Porter | Head Porter |