After Shakespeare in the Park

You are in control of Captain America (No Helmet) and Agent Williams. Time to find out what Fury is hiding. Follow the ghost studs out of the room, then use the S.H.I.E.L.D. panel to reveal a box. Break through the lock to find nothing inside. Follow the ghost studs into the prison to witness Black Widow talking to Loki. Head to the right and swing up the poles to knock down the second box. Destroy the lock to find nothing inside. Follow the ghost studs back out into the hall, then head into the medical bay. Hit the shield switch above the stairs to open the door, then head inside the path and break the lock on the box to be disappointed yet again. Follow the ghost studs to the hangar, then head down the stairs and climb the ladder on the right. Destroy the boxes to reveal LEGO pieces. Build them into a S.H.I.E.L.D. panel, then use it to lower the fourth box. Smack the lock to find nothing inside, then head left. Hit the targets on the back of the Quinjet, then smack the lock to find a Phase 2 weapon. Pick it up, then follow the ghost studs back to the lab to start Helicarrier Havoc.