I found the dialogue in The Avengers very confusing when Agent Coulson explains to Captain America how Doctor Banner was working on the serum of Dr. Erskine.
STEVE: So, this Doctor Banner was trying to replicate the serum that was used on me?
COULSON: A lot of people were. You were the world's first superhero. Banner thought gamma radiation might hold the key to unlocking Erskine's original formula.
STEVE: Didn't really go his way, did it?
COULSON: Not so much. When he's not that thing though, guy's like a Stephen Hawking.
For someone who did not see The Incredible Hulk, it would look like Bruce Banner was working in replicating the serum, when that is totally false. It was actually deceived by Thunderbolt Ross, clearly stated on the film:
THUNDERBOLT ROSS: Banner's work was very early phase. It wasn't even weapons application. He thought he was working on radiation resistance
Either I'm totally wrong here and I didn't understand the dialogue, or Agent Coulson was explaining himself in a very S.H.I.E.L.D way, which basically means to hide the truth from Captain America, or the whole dialogue does not make any sense. Bruce was never working in replicating the serum, that was the hiding intention of Thunderbolt Ross.