It sounds like Joe Goldberg still has a few loose ends to tie up.

While Netflix hasn't announced any details regarding a potential fifth season of You, star Penn Badgley has suggested fans haven't seen the last of his book-loving serial killer. In fact, the actor just teased when he thinks the Greg Berlanti and Sera Gamble series may finish off.

"I know what Greg pitched me a few years back as what he thought was the right way to end," he told British GQ in an interview out March 14. "If there's another one, it's going to be, I think, a grand finale."

Season four saw a bit of a character change in Joe—at least, momentarily—as he tried to kill his evil tendencies, and that's something Badgley said was much needed for the series.

"It has to go to this place for five episodes where it's like, 'Is he going to become a hero as we've all wanted him to?' It doesn't make any sense when Joe becomes a hero," he admitted. "This is the only place the show could have ever gone and remain relevant, remain responsible, remain intelligent, remain sensitive, but true."

Badgley added of season four, "The whole thing has been building towards seeing Joe in a different light, truly, which we've never ever done before."

And while the latest batch of episodes introduced a new side of his character, co-creator Gamble recently teased that a possible fifth installment could see an even "more dangerous" Joe Goldberg.

"We have spent four seasons constructing these characters who are violently wealthy, but not all of them are that smart or that ruthless," she previously explained to E! News. "If Joe is all of the things that he is and now has unlimited resources and access, he's become the thing that he envied and judged from afar. It gives us a lot of new opportunities."

But until then, catch up on all four seasons of You on Netflix.