The game Tales from the Floating Vagabond is right up the alley for this. It had the following adventures published for it:
Title: The Reich Stuff
ISBN: 1-56038-045-4
Author: Lee Garvin
Synopsis: Nazis, Nazis everywhere.
Title: Bar Wars
ISBN: 1-56038-046-2
Author: Lee Garvin, Nick Atlas
Synopsis: Cyborgs, Super Heroes, Brawling and the longest flashback ever.
Title: Adventure With No Name
ISBN: 1-56038-047-0
Author: Craig Sheeley
Synopsis: The Vagabond Universe is plagued with Light Beer. The Patrons are sent to Earth to straighten things out.
Title: Hypercard 54, Where Are You?
ISBN: 1-56038-048-9
Author: Craig Sheeley
Synopsis: The patrons unwittingly become drafted as Time Police.
Title: Weirder Tales...A Space Opera
ISBN: 1-56038-059-4
Author: S. John Ross
Synopsis: The BEMs need the Patron's help to free them from the clutches of their dreaded human wives.
Title: The Cosmic Paternity Suit
ISBN: 1-56038-060-8
Author: Nick Atlas
Synopsis: Greek Gods, Nipples, Demons, Nipples, Frat Weasels, Nipples, oh and did I mention Nipples?
Title: Where's George?
ISBN: 1-56038-063-2
Author: Paul Arden Lidberg with Spike Y. Jones
Synopsis: Political Satire and alternate futures from Earth's political past.