The former World's Strongest Man and Game of Thrones actor "went from Thor to Captain Underpants" in the eyes of one shocked follower.
One fan pronounced Bjornsson the "best looking 200kg beardless man alive".
Bjornsson - aka Thor or The Mountain - unveiled his dramatic razoring to the world in a somewhat understated manner.
FANS reckon Hafthor Bjornsson has slipped and snipped down the superhero rankings - after shaving off his hair.
And far from raving over his shaving, many of Bjornsson's 4.3million Instagram admirers followers gave his new look the chop.
