After donning a cape and tights as the superhero Shazam! last year, Zachary Levi will hit the gridiron to play one of the NFL's most inspiring quarterbacks, Kurt Warner.The 39-year-old actor has signed on to star as Super Bowl champion Kurt Warner in American Underdog: The Kurt Warner Story for Lionsgate, according to Variety.Both Levi and Warner, 48, who went from stocking groceries in an Iowa supermarket to lead the St.
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