An interesting crossover would be Trek and George R.R, Martin's "Song of Fire and Ice" Westeros series. I loved the first 4 books of his series. It would be interesting to see how the various Trek characters (Kirk, Spock, Picard, Voyager, or the NXX Enterprise) would interact with GRRM's characters such as the Lannister sibs, Sansa and Arya Stark, Jon Snow, Princess Dany, The Onion Knight, and so on. Anyone on this board familiar with this.?
A good plot line would be a Fed ship wants to take a gander at a planet with humanoid life and has a weird orbit(long winters). A shuttle, piloted by Chakotay crashes, he is the only survivor. Ensign Sato on a planetary investigation finds not only are the people human but have IndoEuropean, Turkic, Asian, and Semitic language roots. just some possibilities.
I've always pictured Cersei Lannister as an evil Seven of Nine. The Onion Knight Brings to mind O'Brien. King Stannis evokes Captain Picard witha beard. Just, my own mental pictures.
So whaddya think?