When Doc was four, he fell into a river during a fishing trip and has had a fear of it happening again ever since. After the boys learn about this, they and Marty try to change it. But they regret it when it leads to a mishap with a stunt plane, causing young Emmett Brown to become a famous daredevil.

Doc a peur de l'eau depuis l'enfance. Lorsque les garçons l'apprennent, ils essaient d'y remédier en changeant le passé.