Gregory is an old man with a sharp, dry wit. He has little respect for authority and is so opinionated as to sometimes be unbearable. He does, however, provide many of the film's comedic moments. A cross between Groucho Marx and Leslie Neilsen.

Winston is a resident in fantastic physical condition, on account of his career as a professional Olympic dancer. Despite this, he's been verbally abused by his wife to the point of believing himself crippled. During the story Winston rekindles his lust for life.

Joy is an older hippie with a colourful past that hides her career as an engineer. Slim, with flapping arms and dyspraxia that sees her pinball off of walls, she's nevertheless a charming and empathetic person, often able to bring the more depressive members of the bunch a ray of happiness.

Mitch Slack is a disabled ex-mechanic who wiles away his days rebuilding a customised WW2 era BSA motorcycle. He is missing his right leg and has diabetes. Although he starts off thinking of himself, he eventually sacrifices himself for the others when Milo forces him to eat a spiked dinner.

Dawn is a Baroness, born from money and status. Pompous, judgemental and upper class, she is the only person opinionated enough to be able to over-rule Gregory's tongue-twisting and confusing antics. Her death sets the horror element in motion.

Professor Milo is a slimy, oily worm of a man. Recently brought in as administrator of the facility, he is brushed off by Gregory as a man looking to play mind-games. When Milo's sinister plan comes to light, the gravitas of him strikes fear into his residents.