Heidi Klum's Halloween costume may have given away more than she planned. Photos from the workshop behind it appear to tease the villains in "The Batman Part II."

The supermodel got help with her gory severed-hand look from prosthetics artist Mike Marino. Marino is also the artist behind Colin Farrell's turn as The Penguin.

Behind-the-scenes images posted by the supply company The Makeup Armoury showed off the work. Fans quickly spotted something else in the background.

Faces in the background

Several head casts could be seen in the shots. One looked a lot like Charles Dance. Another resembled Brian Tyree Henry and had scarring across it.

That scarred cast sent fans into overdrive with theories that Henry could be playing Two-Face.

Near the casts sat a face that looked like Sebastian Stan. It was next to a box with the word "Zsasz" written on it.

The sequel so far

Robert Pattinson is back as the Caped Crusader in the sequel. Dance, Henry and Stan were all announced as part of the cast back in May.