The Doctor and Mel visit Paradise Towers, a residential complex that promises a peaceful life to its residents. However, the establishment is far from what its name suggests: A conflict persists among the Kangs, humanesque multicolour beings who gather in opposing gangs based on which colour of the rainbow they bear; killer cleaning robots prowl the halls, and a secret in the complex's basement poses the greatest threat of all.
Sylvester McCoy
as The Doctor
Bonnie Langford
as Mel Bush
Richard Briers
as The Chief Caretaker
Clive Merrison
as Deputy Chief Caretaker
Elizabeth Spriggs
as Tabby
Brenda Bruce
as Tilda
Judy Cornwell
as Maddy
Howard Cooke
as Pex
Julie Brennon
as Fire Escape
Annabel Yuresha
as Bin Liner
Catherine Cusack
as Blue Kang Leader
Astra Sheridan
as Yellow Kang
