Mars and Venus

"Mars and Venus" is the fourth episode in the eighth season of Doctor Who, set back on Earth in present day where Doctor Edward Bradley and his team have discovered several frozen bodies in Antartica, unwittingly reviving the Ice Warriors, an old foe of the Doctor.

Synopsis
Arriving in modern day Earth, the Doctor and Billy find the weather has become increasingly cold, and that Doctor Edward Bradley has discovered several frozen bodies in the Antarctic. The Doctors fears the worst, and when the Ice Warriors led by Commander Izaryx awaken and destroyed Bradley and his team, Earth is plunged into a deadly war with Mars.

Ice Warrior's plan
Upon his thawing and regeneration, Commander Izaryx leads his kin through Bradley’s lab and make it their base, where some of the Ice Warriors begin to rapidly decrease the temperature with the weather disruptor. Izaryx and his men plan to freeze the Earth so that they came build a vessel to take them back to Mars.