Doctor Who: Spearhead from Space (Part 3)

"Spearhead from Space (Part 3)" is the third episode of series seven of the British science fiction television series Doctor Who and the 256th episode of the series overall. It is the third chapter of the "Spearhead from Space" serial and was directed by Derek Martinus and written by Robert Holmes. It first aired on BBC One on January 17th, 1970.