The Stix brothers come from an unknown number of apparently identical mutants, all of whom are contracted to the Search/ Destroy agency. They are on the whole utterly mercenary and without scruples – ice-hearted killers who affect the look of gunfighters from Earth’s Old West, with an unflinching and laconic demeanour to match.
Nobody is sure how many Stixes there are. There seem to be an endless supply to take up the family feud and cause trouble across the galaxy. On the planet Freedonia there is a town called Stixville full of Stixes, including Stix women and children.