Star Trek Crossovers
Star Trek: Alternate Original Series (Movies)
Three Times Is the Charm by navaan
Summary: They meet as boys, then they meet as troubled young men, but the world will know their names later and not for the trouble they caused or the footsteps they followed, but for the example they set themselves.
Two Aliens Walk Into A Bar by Shopfront
Summary: Two famous faces meet while hiding behind not-very-sneaky pseudonyms on a far flung alien leisure planet. (In which Jim is his own hurt/comfort, and Clark enjoys playing up the ageless enigma card.)
where no one has gone before by navaan
Summary: Clark learns that life as an alien on earth could have been different. That he falls in love on the way seems like a complication. But who said things had to ever be easy?
Star Trek: TNG
Stardate 411123 by Henry Jones, Jr aka sabershadowkat
Summary: Clark and Lex have a future together.
Star Trek: Voyager
Secrets; Linger by in_the_bottle (Genie)
Summary: "To despise each other as much as they did required passion."