I have played about 25% of the game, and the entire time Mr. Incredible and Frozone have been following each other around the whole time. Because there are two characters anyway, the game is at its best when two people are playing. When there is only one person playing, the other character doesn't do much (and when he does, not very well).
But when there are two people playing, the game is totally fun!!! Rent the game if you have someone to play with!