This Old Cub is a 2004 documentary film. The film is centered on former Chicago Cubs third baseman Ron Santo and both his playing days and his battle against diabetes. The film was written, co-produced, and directed by Santo's son Jeff. It is often mentioned during Cub game broadcasts by Pat Hughes, who was Santo's partner in the WGN Radio booth. The film was a gift from Jeff to his father as a part of the "Ron Santo Day" celebration that season after Santo had both his legs amputated and had just missed induction into the MLB Hall of Fame a few months earlier. A portion of all proceeds from the release of This Old Cub are donated to the Juvenile Diabetes Research Foundation. The film has raised over a half-million dollars for the JDRF. Cub first baseman Ernie Banks, Gary Sinise, Bill Murr