Doctor Thaddeus Sivana has been around for as long as Shazam/Captain Marvel has, debuting in 1940's Whiz Comics #2. Unlike Shazam, who has numerous special powers, Sivana's formidability comes from his mind, as he uses his genius intellect to create weapons and gadgets to antagonize the World's Mightiest Mortal. However, in the rebooted New 52 universe, Sivana gained the ability to see magic after his right eye was hit by magical lightning. With Black Adam off the table, Doctor Sivana is the next best choice to serve as Shazam's main villain, and as you can see from the Mark Strong photo above, his physical appearance could match the character's pretty closely, albeit looking less weak. Outside of the comics, Sivana has appeared in Batman: The Brave and the Bold and Justice League: Gods and Monsters, although the latter featured an alternate universe version of the mad scientist.