This amazing series from Sega is pretty well described by its title. Fantasy IN SPACE!
You travel between planets instead of diferent countries. You go inside ancient abandoned scientific facilities instead of ancient abandoned temples. You wear ceramic/carbon plate and ceramic/carbon blades instead of steel/adamantium equipment. You face robots instead of golems, monsters spawned from scientitific experiments instead of monsters spawned from magic experiments, alien entities instead of outsider entities. So basically lots of refluffing all around.
Classically, things were much better in the old days, but then somebody screwed up something,
countries planets exploded, whatever government was left is weakened, paranoid, or both, and new
greedy mercenaries heroes are needed to guide whoever's left to a brighter future. Your sucesses will lead to the restoration of great lost technologies and saving countless lifes. Your mistakes will result in whole civilizations if not worlds kicking the bucket.
Eventually that is. As this campaign would start at level 1, you'll be starting as simple rookies/recruits.