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Featuring: Patrick Troughton, Frazer Hines, Wendy Padbury
Zoe and the Doctor submit themselves to the Krotons' IQ tests and are selected to enter the Dynatrope, the Krotons' ship. There they watch as the crystalline Krotons are brought back to life.
The episode cliffhanger sees Jamie reeling under the Krotons' mind device.
Synopsis Source: Doctor Who Guide