The unmade film was also called NIGHT OF DARK SHADOWS, which they scrapped when Jonathan Frid refused to return. They threw the entire treatment out and only kept the title, and the released version was entirely different from the initial draft. From what I've gathered, the original treatment went like this:

A few years after the events of HOUSE, Maggie returns to Collinwood for Elizabeth's funeral. She holds a seance in order to contact Elizabeth's ghost for some reason and winds up in 1875. It's pretty much like the television storyline; all the 1895 Collins look like their 1970s counterparts. Quentin is there and gets cursed by Magda and becomes a werewolf. He systematically begins killing the Collins family one by one, as the curse will not be lifted until all Collins are dead.

Knowing that the only person who can defeat Quentin is Barnabas, she frees him from his coffin and convinces him to stop Quentin. Just as Barnabas is about to plunge his silver handled cane into Quentin's chest, Maggie arrives back in Collinwood, 1973. All of the cast that died in HOUSE are now alive, and Maggie realizes she changed history.

But something seems odd, and suddenly Barnabas walks into the room and tells her he has been awaiting this day for a century. He professes his undying love for her. Barnabas tells her that the only way that they can spend eternity together is if she becomes a Collins, and to become a Collins, she must become a vampire. The camera spins around the room, and one by one, the entire family reveals their fangs.

Turns out that these aren't the Collins family she knew from the 1970s; these are the Collins she met in 1895. Barnabas has turned them all. "Her" Collins family never existed, as the vampire Collins were the last of their line.

Realizing that by enlisting Barnabas in trying to save the 1895 Collins family in order to ensure the existence of the modern Collins, she instead doomed them from ever being born. She races to Widow's Hill, with Barnabas in pursuit, and jumps to her death.

The last shot of the film is Barnabas, slumped down on his knees, utterly broken, knowing that he is cursed to an eternity without his soulmate. He looks up at the sky and sees the sun beginning to emerge, and the film fades to black. The sound of Barnabas screaming is heard as the credits roll. It's intentionally left ambiguous, but the implication is that he allowed himself to be consumed by daylight.

Jonathan Frid initially showed interest in this version, but according to Sam Hall, he did a complete 180° and demanded it be rewritten so that he was not a vampire. Obviously there was no possible way this could ever work if Barnabas was human, so they went with Plan B, which was the Possession of Quentin story.

May i ask where you got that sypnosis from?

Mostly from my interview with Sam and Matt Hall circa 1994. Other information was gathered secondhand from Jim Van Hise from his interviews with the original cast.

The film was supposed to be called Curse of Dark Shadows and was supposed to be about the origins of how Barnabas became a vampire. In House, he references them as a they that made him this way, most likely the Leviathans, It was probably going to be a lot of flashback stuff.

Carnabas-cool thanks

Rc-i see cool thanks