Fan Casting Thaddeus Sivana, Sr. in Earth-5

Thaddeus Sivana is the father of the Sivana Family and arch nemesis of Captain Marvel. He is a mad scientist bent on conquering the world as well as defeating the world's mightiest mortal. After communing with his otherworldly counterparts through comic books, he presented a plan which would require a piece of suspendium from each of them. He used this to create a new day, an eighth day, called Sivanaday.