This new poster for Marvel's Captain America: The First Avenger showcases a dark, brooding side to the sentinel of liberty. But then the first official high-res shot of him in his full costume looks bright and cheerful, as you'd expect from the optimistic hero of the Greatest Generation.

Click both images to enlarge. [Marvel and Empire via SuperheroHype]

But this image is a bit less happy looking.

Hayley Atwell as Peggy Carter

Red Skull and the Cosmic Cube, plus first glimpse of Tommy Lee Jones as Col. Phillips

Captain America gets shirty