Doctor Who
The Ice Warriors are a species of war-like alien who come from the planet Mars. They are human-like green reptiles who can only live in cold climates. The Doctor had to stop them from invading the planet Earth when their home planet became too hot for them to live in. However, they later became a more peaceful species when they joined a group of planets called the Galactic Federation. Other planets in the Federation include Earth and Peladon.