The Wheel of Ice is a ring of ice and steel turning around a moon of Saturn. It is home to a colony mining minerals for a resource-hungry future Earth. Aboard the Wheel the second Doctor, Jamie, and Zoe find a critical situation and three strangers who have just turned up out of nowhere and look like prime candidates to be accused of sabotage. The Doctor finds himself caught up in a mystery that goes right back to the creation of the solar system.
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