An alien species that has been hidden on Earth for decades threatens to take over the planet. The only hope for humanity is S.H.I.E.L.D. But when their super soldier program fails to bring any results they look for help in a group of unpredictable civilian superheroes, each with their own motivations. To lead the team S.H.I.E.L.D. goes to the only super soldier to be successful. The only person to fight the aliens and win. The person who person who gave his life to save his country. S.H.I.E.L.D. must resurrect the World War II hero Captain America.