| Maurice Dean Wint | Quentin, the Cop |
| Nicole de Boer | Leaven, the Maths Student |
| Nicky Guadagni | Helen Holloway, the Doctor |
| David Hewlett | David Worth, the Architect |
| Wayne Robson | Rennes, the Fugitive |
| Andrew Miller | Kazan, the Autistic Man |
| Julian Richings | Alderson, the First |
Civilians find themselves imprisoned in a maze of booby-trapped metallic squares.
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