A sea captain's body is possessed by a malevolent entity for nearly a century, forcing him to commit atrocities under the control of the Esoteric Order of Dagon. After being freed, the captain seeks a way to travel back in time and undo the damage caused by the cult, but the group will do everything in its power to eliminate him.
H. P. Lovecraft's the Old Ones
Captain Russel Marsh, a sea captain from 1930, was possessed by a Great Old One for 93 years, forcing him to commit heinous acts under the influence of the Esoteric Order of Dagon.