Of the members, Yeti and Tygerstryke were original to the program, Rictor joined to take vengeance on Cable for killing his father (actually done by Stryfe), and Grizzly joined as another former member of the Six Pack who had an axe to grind with Cable.
Of the members, Yeti and Tygerstryke were original to the program, Rictor joined to seek revenge on Cable for killing his father (actually carried out by Stryfe), and Grizzly joined as another former member of the Six Pack who harbored a grudge against Cable.