As you can see from the pictures I've posted the set of rules for these figures is called Chaos on Cronos. I must apologise for the poor pictures, I'm still getting about a 50/50 success rate with the shots.
I bought these figures to use with Space 1889, but I can see a use for these in my Pulp 50's games. I've bought the "artillery" pieces for each of the races and I like them. Real Flash Gordon style.