Luke Skywalker is a secret character who appears in Lego Indiana Jones: The Original Adventures. You can not play as him but you can find him in the game. You have to find him and four other Star Wars characters to unlock Han Solo as a playable character. Luke is to be detected in the Into the Mountains level and can be found at the bottom of the chasm. Use Willie's scream or a Bazooka Trooper to blow up the ice on a ledge above. This will result in Luke being freed from his prison. To get him in the story, get the bazooka from the area with the truck and go back.