A quick recap of how Steve Rodgers became Captain America/Captain America's main focus is on saboteurs as he keeps his identity secret by being an army private/Captain America learns that the Red Skull is behind the sabotage.
A mysterious sword wielding man breaks into Avengers headquarters and demands to be allowed to join.After the heroes defeat him, he concocts a plan to kidnap Captain America.
Captain America leads the Avengers into Sin-Cong to answer a distress call, only to find it's a trap set by the nation's superhuman leader, the Commissar.