H. P. Lovecraft’s The Old Ones

In 1930, sea captain Russel Marsh experienced a profound transformation, and for the next 93 years, he was not in control of his own body. Possessed by a Great Old One, he carried out horrific deeds for the Esoteric Order of Dagon. Now liberated, he seeks a method to travel back in time to undo the atrocities he unleashed upon the world. However, the cult has different intentions and is determined to eliminate him at all costs.