Emmy the Frog is a tomboyish speed demon with an insatiable passion for racing, and she's Penny's closest friend and fiercest rival. Their competitive spirit fuels their friendship, as they constantly challenge each other in boxing, racing, and any other sport they can find. Emmy possesses an extraordinary ability that transforms her into a living projectile when she covers her body in saliva. The more she moves, the more kinetic energy she generates, increasing her speed and hardening the saliva until she becomes virtually invisible. This unique talent makes her a formidable opponent in any race, and her determination to win is matched only by her love for her friend and rival, Penny.