Director Kenneth Branagh just revealed the Destroyer at Marvel's Comic-Con booth. Check out the photos of the enemy Thor faces in the upcoming movie.

Destroyer from Thor at Comic-Con 2010
Destroyer from Thor at Comic-Con 2010 #2

The Destroyer is an enchanted suit of armor forged by Odin, and when it first appeared it was hinted that the Destroyer had been created as a weapon to face some dark menace from the stars. It is first seen residing in the Temple of darkness in Asia. The Destroyer is used by Thor's arch-foe Loki on several occasions, and each time has actually come close to killing Thor.