Roller-skating through Venice Beach, The Optimist runs into a lady racing driver. After helping mend her bust tyre, he follows the Girl to the racing circuit where he becomes a mechanic and soon afterwards finds himself one of the drivers. Suddenly it's Grand Prix time and the race is on - his prize, the Girl of course - in competition with a bad-tempered Cabbie! Miraculously he wins, but fame and fortune is brief - he needs to make a quick getaway before anyone finds out his true identity.