Fantastic Voyage

Four men and a woman are reduced to a microscopic fraction of their original size, sent in a miniaturized atomic sub through a dying
man’s carotid artery. Passing through the heart, entering the inner ear where even the slightest sound would destroy them, battling relentlessly into the cranium. Their objective… to reach a blood clot and destroy it with the piercing rays of a laser. At stake… the fate of the entire world.