you have to unlock players, beat the computer in normal matches (not story mode) something like 100 and you get Captan Planet.
story mode is alright, funny as fuck some times (the end is the best)
online play does not exist in this game.
its a good buy if you have friends that have the game, if you dont have friends that have the game do not get it.
i had it, then i sold it because i got bored with it, with having no friends that have it it gets boring FAST.