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.

Rating: 6.5

Cast:

Julie

Brennon

Annabel

Yuresha

Catherine

Cusack

Astra

Sheridan

Joseph

Young

Sylvester

McCoy

Bonnie

Langford

Richard

Briers

Clive

Merrison

Elizabeth

Spriggs

Brenda

Bruce

Judy

Cornwell

Howard

Cooke

Julie

Brennon

Annabel

Yuresha

Catherine

Cusack

Astra

Sheridan

Joseph

Young

Sylvester

McCoy

Bonnie

Langford

Richard

Briers

Clive

Merrison

Elizabeth

Spriggs