Plutovian karate

Plutovian karate was a martial art formulated by the Plutovian species and known to the Third Doctor. The Doctor once attempted to demonstrate this intensive, tiresome and inefficient form of combat before he gave up, huffing and puffing, and sheepishly explained that the Plutovians were actually pretty poor fighters, instead having eventually decided to put their impressive moves to better use on the dance floor. (NOTVALID: The Third Doctor's Guide to Plutovian Karate)

Behind the scenes

 * Plutovian karate is a spoof of the concept of Venusian aikido.