American Underdog is a hollow film something like empty calories, it has no dramatic or emotional effect coming from the performers even with a story that could have been effective.
Un like The Rookie in which Dennis Quaid played Jim Morris a late addition to Major League Baseball, who would not give up and eventually played in the Major Leagues and had the opportunity to give his non-believing father his first winning game baseball.
Here Zachary Levi looks like a quarterback who travels a difficult path to reach the Super Bowl in professional football, the heart and determination are constantly refereed to but the emotion is either overplayed or lacking as directed by the Erwins.
Even with enough material to make a fine sports success film this production becomes a religious commercial rather than entertainment.