After detecting traces of trisilicate on the planet Yama-10, a survey team of Ice Warriors land and start to clear the ground for mining. The Cybermen and their Cybermats also arrive and claim the planet. Taking their battle to the Polar Caps, where both sides are more equally matched, they battle. The Polar Caps melt and the Cybermen are destroyed by the melted ice, while the Ice Warriors are entombed in the ice — at least until the spring thaw.