Synopsis by Hal Erickson
In the fifth episode of the six-part story "The Ice Warriors," the Doctor (Patrick Troughton) realizes that the computer he hoped to use to defeat Varga (Bernard Bresslaw) and the Martian Ice Warriors is useless. As an alternate plan, the Doctor intends to deploy a powerful ionizer against the villains. But this also proves impossible, inasmuch as the Doctor and a team of Earth Scientists need the Ice Warriors' space ship to survive. Set during the "New Ice Age" of the 31st century, "The Ice Warriors, Episode 5" was written by Brian Hayles, and originally aired on December 9, 1967; this episode apparently no longer exists.