The Faceless Ones
Nurse Pinto was the head of Gatwick Airport’s first aid centre in 1966.
Her identity was taken over by a Chameleon. When the Second Doctor exposed the false Pinto, she tried to kill the false George Meadows for his betrayal, but was killed herself when the armband-like device was removed from the original’s arm. The real Pinto then accompanied The Doctor to the Chameleons’ satellite. (The Faceless Ones)