Batman: Arkham - Ranking EVERY Villain Worst To Best

A truly unsettling entry, and likely one that many players - myself included - didn't know about until a walkthrough showed them where to go.

Starro is the easter egg to end all easter eggs in the Arkham Knight prequel DLC, A Matter of Family. As Batgirl, the player is free to explore an already-creepy-enough abandoned theme park in the middle of the ocean. There are several strange posters around the place, promoting a freak show that features a mindless man with a one-eyed starfish stuck to his face.

Then you enter an incredibly hard-to-see grate to find the one behind this strange being. Starro himself, the mind-controlling alien and the first to take on the Justice League, is housed in a darkened room, pressed up against a cylindrical glass tank and watching closely.

He doesn't do anything...except stare. And stare. And stare. You have to wonder how they even got him in the tank in the first place.