A scientist working with genetics creates a horrifying flying creature that feeds on human blood. Following a gruesome trail of dead bodies, Scotland Yard investigators must scramble to halt its ravenous rampage.
| Actor | Role |
|---|---|
 Peter CushingDetective Inspector Quennell | Detective Inspector Quennell |
 Robert FlemyngDr. Carl Mallinger | Dr. Carl Mallinger |
 Wanda VenthamClare Mallinger | Clare Mallinger |
 Glynn EdwardsSgt. Allan | Sgt. Allan |
 Kevin StoneyGranger the Butler | Granger the Butler |
 Vanessa HowardMeg Quennell | Meg Quennell |
| DDavid GriffinWilliam Warrender | William Warrender |
 Roy HuddMorgue Attendant | Morgue Attendant |
| WWilliam WildeFrederick Britewell | Frederick Britewell |
| SSimon CainClem Withers | Clem Withers |
 Russell NapierLandlord | Landlord |
 John PaulMr. Warrender | Mr. Warrender |
| LLeslie AndersonCoachman Joe Trager | Coachman Joe Trager |
| DDavid LyellStudent with Toy Spider | Student with Toy Spider |
 Drew RussellConstable Smith | Constable Smith |
| RRobert CawdronChief Constable | Chief Constable |
 Kenneth ColleyJames | James |
| RRoy Evans2nd Porter | 2nd Porter |