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.
as The Doctor
as Mel Bush
as The Chief Caretaker
as Deputy Chief Caretaker
as Tabby
as Tilda
as Maddy
as Pex
as Fire Escape
as Bin Liner
as Blue Kang Leader
as Yellow Kang
as Young Caretaker
