The Erwin Brothers, whose faith-based “I Can Only Imagine” (based on the song) was a hit a few years back, first-teamed with “American Underdog’s” biggest name, Dennis Quaid, on that film.

This one is the unlikely story of a Super Bowl quarterback who tried and failed to break into the game, and even wound up stacking groceries, if memory serves.

Zachary Levi of “Psyche” and “Shazam!” has the title role. “American Underdog” opens Christmas Day.