Neal McDonough ("Arrow") stars in "Greater," the true story of Brandon Burlsworth, the greatest walk-on in the history of college football. He plays Burlsworth's brother Marty, who inspired and supported Brandon's dream of playing for the Arkansas Razorbacks, and who made it through sheer determination and persistence. McDonough, who has played supervillain Damien Darhk in "Arrow" and "Legends of Tomorrow" and superhero good guy Dum Dum Dugan in "Agents of S.H.I.E.L.D," answered my question...