Doctor Who: The Tomb of the Cybermen (Part 4)

"Episode 4" is the title to the fourth and final chapter in "The Tomb of the Cybermen" storyline from season five of the British science fiction television series Doctor Who. It is the fourth episode of the season and the 173rd episode of the series overall. It was directed by Morris Barry and written by Kit Pedler and Gerry Davis. It was produced by Peter Bryant. This episode first aired on BBC One in the United Kingdom on September 23rd, 1967.