The Cage

The Cage as seen through Henry van Statten's security monitor. (TV: Dalek)

The Cage was an area located within Henry van Statten's installation known as 'the Vault'. Within the Cage was a chained Dalek (dubbed the "Metaltron") that Van Statten had acquired. When Rose Tyler came in contact with the Dalek, it absorbed the DNA of the time traveller and gained the strength to escape. (TV: Dalek)