Synopsis by Hal Erickson
In the first episode of the six-part story arc "The Sensorites," the TARDIS materializes in a 28th century Earth spacecraft. The Doctor (William Hartnell) and his companions soon discover that the craft is trapped in an enormous Sense-Sphere, controlled by a race of telepathic aliens called the Sensorites. These beings are none too happy that the TARDIS has arrived, holding the Doctor and his friends responsible for a horrible disease that has been wiping out the Sensorite population. Written by Peter R. Newman, "Strangers in Space" originally aired on June 20, 1964.