As any superhero film connoisseur knows, the strength of the story lives and dies by the strength of the villain - literally and metaphorically. Do they have Loki's sass? Kilgrave's obsessive manipulations? Kingpin's ruthlessness? In Shazam!, Mark Strong plays the film's big bad, Dr. Thaddeus Sivana, and is just as cruel as he is bald (very). But he's actually not the only antagonist that pops up over the course of Shazam! During a brief but ominous midcredits scene, an imprisoned Sivana is visited by another villainous presence from the comics: a superintelligent evil two-inch talking worm named Mister Mind.
After having lost a battle with Billy Batson's Shazam (played as an adult by Zachary Levi), Sivana is locked away in a prison somewhere. We see him, sapped of the powers the now-defeated Seven Deadly Sins imbued him with, frantically scribbling a