This has the category "Ice Warriors", but the text makes no mention of them. Is this speculation, or is it stated in the story that Martian karate comes from them?
When he was attacked by Primords, the Doctor attempted to stop them using Venusian aikido. When this didn't work, he then moved onto the Martian karate, but neither method proved effective in stopping the Primords. (PROSE: Inferno)