Okay, I'm going out on a limb: there are two reasons 'Raiders of the Lost Ark' was a success. 1) The opening sequence in which Indy judges the weight of the gold trinket and replaces it with the bag of sand, but gets it wrong and ends up trying to outrun a boulder, and 2) The fact that Karen Allen played Marion Ravenwood.
Okay, so I'm biased. I had a huge crush on Marion/Karen -- who wouldn't? Okay, okay, I still have a crush on them/her.
Premiere has some very cool stills from Crystal Skull, including the one above.