The Ice Warriors
The Ice Warriors are a mighty race hailing from Mars, the Red Planet. They are intelligent, powerful individuals and the Doctor has faced them at their most ruthless as they tried to wrestle Earth from humanity.
But these hissing, menacing Martians have a code of honor and when the Third Doctor encountered them on Peladon he found they had abandoned their warlike ways in favor of a more peaceful, honorable approach to other species.
The Ice Warriors are therefore capable of great good and terrible wickedness. Perhaps they are more like humanity than it would first appear…