Dark Dominion was created by Jim Shooter and Steve Ditko, the co-creator of Spider-Man.
Alexander is the author of a book entitled Dark Dominion, in which he explored the idea that another world occupied the same spacetime as our own.
The main villain, Chasm, has chosen Manhattan to be his headquarters on Earth because of the vast population on whose fears he could draw from.
He perceives this alternate dimension as an energy-filled double of our own, with various demonic-type bits of architecture added to it.
Afterwards, all their comics ceased to be published and the characters - including those of Dark Dominion - were purchased by Golden Books.