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 McCoyThe Doctor
Bonnie LangfordMel Bush
Richard BriersThe Chief Caretaker
Clive MerrisonDeputy Chief Caretaker
Elizabeth SpriggsTabby
Brenda BruceTilda
Judy CornwellMaddyHoward CookePexJulie BrennonFire EscapeAnnabel YureshaBin Liner
Catherine CusackBlue Kang LeaderAstra SheridanYellow KangJoseph YoungYoung Caretaker
