WARNING: this article contains minor plot spoilers concerning the latter half of the first season of Mindhunter. You should watch the first season, because it's brilliant, and then read this article.
In the latter half of the first season of Mindhunter, Anna Torv's Wendy Carr begins feeding a stray cat that is hanging around her new building. We never see the cat, but the cans of tuna she leaves out are eaten. That is, until one of the cans is covered in ants with no sign of the cat. It's an odd little subplot, and during an interview on TV Line with Torv, she explained what her initial theory was.
"I always take things a little too [introspectively], so when I first read it in the script I was like, 'Oh my God, wow, this is actually interesting,'" the Fringe vet recalls, before laying out her theory: "I thought, 'This little kitten is representative of all these faceless [victims] and we only notice the ones that are dead because they have families that are looking for them. And then here's this little abandoned cat that no one is going to care about. And if that was a person, it'd be the same thing. That's what I first thought when I read it, but that's just because I'm crazy. I was making it so deep when probably she's just, you know, feeding a cat."
However, when Torv went to David Fincher about her theory, it turns out she was wrong.
The actress later ran her theory by Mindhunter exec producer David Fincher, who quickly informed her, 'Oh… no, that's not it,'" she guffaws. Fincher then explained to her that the cryptic series of scenes were, at least in part, suggesting to the audience that perhaps "there was a kid in the building who's going around killing cats. And it's a birth of a new sociopath that we don't quite know about. Because that's how it starts — with [inflicting harm on] animals."
That is an interesting way to look at it, for sure. The show brought up animal mutilations often, so it wouldn't be surprising that they are hinting that someone else dangerous is out there.
Summary: In the late 1970s, two FBI agents expand criminal science by delving into the psychology of murder and getting uneasily close to all-too-real monsters.
Mindhunter, created by Joe Penhall, stars Jonathan Groff, Holt McCallany, Hannah Gross, Anna Torv, Sonny Valicenti, and Cotter Smith. Check it out on Netflix now.