In the concluding episode of the four-part story "The Space Museum," the Doctor (William Hartnell) is still struggling to avoid the fate in store for himself and his companions, as mummified exhibits in a Xeron space museum. In the course of events, the Doctor's travelling companion Vicki (Maureen O'Brien) aligns herself with the Xeron slaves of the despotic Moroks. This is beginning of the end for the Moroks, as the Xeron stage a revolt to gain control of their planet -- and, possibly, to spare the lives of the TARDIS crew. Written by Glyn Jones, "The Final Phase" first aired on May 15, 1965. ~ Hal Erickson, Rovi