At some unknown point in his life, Herman found himself serving aboard the Flying Dutchman under Davy Jones. He was covered with barnacles and shredding fish scales and he had an unhappy, toothless look.
Herman fought in the Battle of Calypso's maelstrom, during which he swung aboard the Black Pearl and dueled Will Turner and Elizabeth Swann during their impromptu wedding ceremony. Herman lunged at Will, but the latter stabbed him before Elizabeth kicked him over. By the time Swann and Turner kissed, Herman was figuring another pirate, dueling him in sword combat. Following the death of Davy Jones and Will Turner's inauguration as captain, Herman likely reverted back to his human form. His further fate remains unknown.