I would watch this trilogy.

2nd film: "Unbreakables" - Bruce Willis' character embraces his unbreakable status, becomes superhero. Sam Jackson's character is revealed in the first film to have info on multiple "unbreakables", so it turns out he's assembled a team like "some weird bizarro Nick Fury". The ending should be like the ending of Empire Strikes Back, where things are going bad for Dunn, despite his new superhero status. Still directed by M. Night Shyamalan, mostly a cast of unknowns. Robin Wright's character returns.

3rd film: "Broken" - Elijah Glass has been locked up since the end of the first film; starts with him getting out, with a new network of other villains, and smearing David Dunn, who then has to save his reputation. Also, at some point, Glass captures Dunn and attempts to make himself unbreakable. Still directed by M. Night Shyamalan, mostly a cast of unknowns.