The Ice Warriors (also known as Martians or Ice Lords) are one of the many recurring alien species encountered in the television series Doctor Who. They first appeared as enemies of the Second Doctor in the 1967 serial "The Ice Warriors". They are warriors from planet Mars.
Despite the fact that they have primarily appeared as villains in the series, subsequent appearances have depicted Ice Warriors that have eschewed violence and even ally themselves with the Doctor.
In the their first appearance in the episode "Ice Warriors" the ice warriors try to take over an Artic base on Earth but are thwarted by the second Doctor.
In "The Seeds of Death" the Ice Warriors are led by the Ice Lords who have thinner armor. It is revealed that the real leader in the Grand Marshall. They attempt to freeze Earth and lower the climate so they could live there and the humans would die out.
In the episode "Curse of Peladon" it is revealed that the Ice Warriors have renounced their evil past and have joined a galactic federation as peace keepers. They even team up with the Third Doctor.