HOLLYWOOD, July 17, 2000 -- It's not every day that superheroes get married, but this weekend history will be made. Well, sort of. Actor James Marsden, 26, star of the superhero hit "X-Men," announced today that he's marrying actress Lisa Linde on Sunday. The two have been together since 1995. Marsden made the announcement on KROQ-FM in Los Angeles this morning while promoting the movie, in which he plays Cyclops, a mutant who shoots deadly rays out of his eyes.