Possible Clues:

• Norse Mars
• Chris Hemsworth title role
• Norse god for whom Thursday is named
• 2011 role for Chris Hemsworth as Odin's son
• Nordic God of Thunder
• Sif's husband in myth
• Title foe of Loki in a 2011 film
• Wielder of a hammer called Mjölnir
• Mythical hammer-wielder
• God almost a source of irritation?