5. Indiana Jones (Harrison Ford) - Raiders of the Lost Ark
This one is obvious, but there might be a ten-year old out there that hasn't seen Indy on screen. Sure, we saw hints of his past throughout the four movies (I would like to say 3 1/2, but whatever), but really think about what's mentioned or implied. He's got friends all over the globe so you know he's looked for artifacts and had gotten into sticky spots on a regular basis. Let's not forget that between Indy 3 and 4 he fought in WW2 (and WW1 according to Young Indiana Jones), not to mention was part of some government conspiracy that was referenced in Indy 4. He even rode with Pancho Villa!