Bear Season (1970)

An adolescent boy lives in Detroit after World War II with his Polish immigrant mother Olona and his late father's brother Izzy, a former soldier. Izzy likes to tell Chester stories of his father's military days, especially about he served alongside Wojtek, a legendary soldier bear. Chester is the only one who believes the tales and his unwavering faith sets him off on a road trip to uncover the truth and confirm Wojtek's existence.