I just started playing, and played the other lego games. I'm playing Crystal Skull Chapter 1, and finished all the first stories. When you go into play the Treasure Levels it says you need to use specific players, like the one on the train you need someone with a gun and someone who can jump.

How do you start the level with these people? It won't let me select the people I have accumulated. It's not like when you get to a bonus level, and it puts the people in for you.