Doctor Who: The Invasion of Time (Part 4)

"The Invasion of Time (Part 4)" is the fourth chapter in the "The Invasion of the Time" serial, which ran through episodes 5-8 in series 15 of the television series Doctor Who. The episodes originally aired in four parts on BBC1 from February 4th to March 11th, 1978. The serial was directed by David Maloney and written by veteran Doctor Who screenplay writer Terry Nation. In this episode, The Thal resistance fighters storm the Kaled bunker. The Doctor faces a strong moral dilemma and Davros makes his final move as the Daleks patrol the bunker corridors wiping out all opposition.