Hollywood star Ashton Kutcher has revealed he is "lucky to be alive" after he was left unable to walk, see or hear due to a rare autoimmune disorder.
The actor, 44, detailed the awful symptoms he suffered in an upcoming episode of Running Wild with Bear Grylls: The Challenge.
In the sneak peek clip of the episode, shared by Access Hollywood, the That '70s Show star said: "Like two years ago, I had this weird, super rare form of vasculitis, that like knocked out my vision, it knocked out my hearing, it knocked out like all my equilibrium. It took me like a year to build it all back up."
