Mimi and Shen, fierce competitors, skip their science lab and end up in the classroom by themselves. Shen challenges Mimi to a paper car race because he's bored, but their imaginations soon turn the game into a battle across the galaxy. The classroom turns into a cosmic track, paper cars become futuristic racers, and the two must contend with crazy power-ups. Their teacher enters just as the race is about to get out of control. They are dragged off for punishment after being caught red-handed, but their bond from the adventure is barely completed.