Spencer (The Faceless Ones)

Spencer was an airplane pilot at Gatwick Airport. His identity was taken over by a Chameleon. The false Spencer piloted Humans to the Chameleons' space station, shot and killed Inspector Gascoigne for getting too close to the truth, and abducted Polly and Ben Jackson. He tried to kill the Doctor, Jamie McCrimmon and Samantha Briggs with a laser, but failed. After the Doctor defeated the Chameleons, the real Spencer was freed. (DW: The Faceless Ones)