Mary-Kate and Ashley Olsen ('Full House', 'To Grandmother's House We Go') play twin sisters (are there any other kind for these two?!). Sam (Mary-Kate) is the sporty, less-popular one, while Emma (Ashley) is the boy and fashion-obsessed one.
Here, the twins sign up for their dad's soccer team (which, to their dad Jerry's dismay, has turned co-ed), however, Emma is picked first out of pity for her dad's Hurricanes team, while Sam is shafted into the loser-ish Buzzards team.
So, to help eachother out, Sam and Emma trade places with eachother (how original!) to play on the opposite teams... until their mom finds out.
Stuck with their original placings, Sam becomes the star buzzard, while Emma does practically nothing on field except distract the other players... until, the final game (coincidentally between the Buzzards and Hurricanes), where they find Emma has a hidden talent...goalie.