The Featherweight Championship was a side competition for robots in the featherweight class, weighing up to 12kg, or 13.6kg in Series 10. There were a total of four Featherweight Championships run throughout the original series of Robot Wars; one in Series 2, one in each series of Robot Wars Extreme, and one in Series 7. However, no champion ever came back to defend their title after they had won it. The first two Featherweight Championships were single battles, while the Extreme 2 and Series 7 competitions consisted of mini-tournaments with qualifying rounds, with two or three robots progressing to the final from each qualifying round.