The Centurions are Annihilus' army of 100 super-powered beings, forced into his service by the shrinking and dying Negative Zone. These minis are all various spare Clix I had in my collection, given interesting paint jobs.
Much as is my style, these colourful aliens can pull triple duty, as they will form a generic "Space" team for SuperSystem, allowing me to try out power combinations that don't fit my other teams.
As for their final role, they can work as Alien civilians in a wide range of games. Not bad for something I had laying around.