Synopsis by Hal Erickson
In the fourth episode of the six-part story "The Sensorites," the Doctor manages to emerge triumphant from his latest crisis. This impresses his Sensorite captors, but they are still convinced that the Doctor -- and by extension, all of mankind -- is somehow responsible for the mysterious disease that is rapidly killing off their race. As the episode draws to a close, a new and even more terrible threat to the well-being of the Doctor and his companions appears on the horizon. Written by Peter R. Newman, "A Race Against Death" originally aired on July 18, 1964.