Q13 is a company-sized game covering science fiction warfare aimed primarily at using 6-15mm figures. It uses the same basic mechanics as IABSM and/or CDS, but is as different in flavour from them as they are from each other.
Q13 is not based on any particular science-fiction universe. The rules are generic: providing a framework into which you must fit the armies you want to field. This framework will translate the vast variety of concepts possible in an effectively infinite science fiction universe into a common idiom, allowing the game’s systems to operate.
From The Page:
One of the things I have wanted to use Q13 for is a series of Invasion Earth scenarios set just after the end of the Second World War. For an as yet unspecified reason, various alien races are attempting to take over the Earth, leading to battles between my WW2 figures and the various sci-fi armies that I'm currently building. Here's the first in the series: Space Bugs versus Americans...
Now this one I've Got To Try! I'm going to get the PDF here shortly and attempt a game within the
next two weeks....)