Kingdom of the Crystal Skull is everything we have come to expect from an Indy movie. It has plenty of thrills, chills, humor, intense action and an intriguiging story line.
I prefer not to divulge the story line. IMO, it's always best to experience a film first hand with out any preconceived notions or knowledge of the outcome.
I will say that this: its awesome to see Harrison back in his most famous role as the best action hero of all time, Karen Allen and Shia LaBeouf complement him extremely well and the ark of the covenant makes an appearance!
Spielberg and Lucas invented the summer time blockbuster, nobody does it better, and that is reason enough to go see this film.