In the tradition of Six Degrees of Separation... try linking. You may use their co-stars and other movies to link everyone together.*
Christian Bale (Batman Begins/The Dark Knight)
George Clooney (Batman)
Val Kilmer (Batman)
Robert Downey Jr. (Ironman)
Tobey Maguire (Spider-man)
Christopher Reeves (Superman)
Brandon Routh (Superman Returns)
Edward Norton (The Incredible Hulk)
Eric Banner (The Hulk)
Hugh Jackman (X-Men)
Ben Affleck (Daredevil)
You're welcome to include other superheroes not listed here. HAVE FUN!!!!
* PS. I already did. You can too!