AllMovie

In the fifth episode of the six-part story "Planet of the Spiders," the Doctor travels to the planet Metebelis 3, in hopes of rescuing his companion, Sarah (Katy Manning). There he is given an ultimatum: immediately return the precious blue crystal, which he stole from Metebelis during a previous visit, or all mankind will be destroyed. Grimly, the Doctor weighs the alternatives, which include his own likely death once the crystal is given back to its rightful owner, spider-empress the Great One. Written by Robert Sloman, "Planet of the Spiders, Episode 5" originally aired on June 1, 1974.