In the third episode of the six-part story "The Ice Warriors," the Doctor (Patrick Troughton) is forced to revive the comrades and recover the spaceship of hostile Martian Ice Warrior Varga (Patrick Troughton). Meanwhile, Dr. Clent (Peter Barkworth), leader of a team of 31st century scientists dedicated to preventing the world from being totally enveloped in ice, appears to have a solution to the Doctor's dilemma. But for reasons best known to himself, Clent refuses to reveal what he knows. Written by Brian Hayles, "The Ice Warriors, Episode 3" originally aired on November 25, 1967; this episode apparently no longer exists.
by Hal Erickson synopsis