Two more posters for Kenneth Branagh's Thor have been released.  Both posters bear the tagline "Courage Is Immortal".  Also immortal: floating heads.

Hit the jump to check out the posters.  Thor stars Chris Hemsworth, Natalie Portman, Tom Hiddleston, Anthony Hopkins, Rene Russo, Stellan Skarsgard, Jaimie Alexander, Kat Dennings, Ray Stevenson, Josh Dallas, Tadanobu Asano, Idris Elba, Clark Gregg, and Colm Feore.  The film opens in 3D on May 6th.

Posters via Empire.

Here's the official synopsis for Thor:

The epic adventure "Thor" spans the Marvel Universe from present day Earth to the realm of Asgard. At the center of the story is The Mighty Thor, a powerful but arrogant warrior whose reckless actions reignite an ancient war. Thor is cast down to Earth and forced to live among humans as punishment. Once here, Thor learns what it takes to be a true hero when the most dangerous villain of his world sends the darkest forces of Asgard to invade Earth.