In the concluding episode of the two-part story "The Rescue," the Doctor (William Hartnell) and his companions endeavor to rescue two spacecraft survivors from intergalactic murderer Koquillon. The plot thickens when it becomes apparent that one of the rescuees may be the Koquillon himself (or herself). With this adventure, Maureen O'Brien joins the cast as Vicki. Written by David Whitaker, "Desperate Measures" originally aired on January 9, 1965. ~ Hal Erickson, Rovi