Captain Chernick was a captain of an unnamed ship. He only made an appearance in the first Alone in the Dark film.
Lionel Hudgens hired the cpatain and his ship in order to find sunken sea chest. After taking the chest out of the water,the professor verified that this was the chest that he was seeking. Not knowing of the actual nature and the contents of the chest, Chernick betrayed the old man by having the professor kept in a locked room.
Upon opening the chest, it released an unseen creature that attacked and killed everyone on board including the captain. The Professor was the only one that managed to survive unscathed.