The Claws of Axos

The Claws of Axos was a serial of Doctor Who that aired in 1971. In Red Nose Day 2013, Claudia Winkleman speculated that the surprise Dermot O'Leary wanted to give her was "an original alien duplication unit" which origniated from the 1971 story. (TV: The Doctor Appears)

Behind the scenes
This is a version of The Claws of Axos that exists within the Doctor's universe.