Morphean Archive, Vol. II
"A large alien spaceship appears, containing human people with magic blue armor. A big draconic monster attacks and the blue people help Earthlings to beat it up by chopping away at one segment of it with swords. Within the spaceship, it is found that there are special cabins for blue and yellow people (since reds are EVIL). The alien planet appears to be very similar to Earth in many respects, but some continents are differently shaped and there are no icecaps due to a higher temperature. (People must live at the poles, since the middle zones would have to be unbearably warm.)"
Nothing special, but I like the world-building bit.