The Order of the Phoenix uses a ritual to summon a hero from another world to aid them in the fight against Voldemort. He isn't exactly what they had expected. Dark!Harry Bashing!Dumbledore Bashing!Weasleys
What if Harry was not the BWL, but his younger brother Damien? Damien goes through all the adventures Harry faced in the Canon World. Harry is left with the Dursleys but is discovered by a member of an organisation called the Shadow Collective. There he will learn of his ancestry and his destiny in life. He returns to the Potters life in Damien's fifth year.