'You' star Penn Badgley reacts to the big season 4 plot twist: 'It doesn't make any sense' to turn Joe into a hero

• Warning: Spoilers ahead for "You" season four, part two.
• At the end of part one, Joe Goldberg appears more heroic as he tries to stop another serial killer.

"You" star Penn Badgley said that the big season four plot twist was the "only place" the show could go to "remain relevant" but "true."

Last week, the second part of the fourth season of "You" premiered on Netflix. At the end of part one, Joe Goldberg, our notorious serial killer protagonist played by Badgley, comes to the realization that Rhys Montrose (Ed Speleers), a famous author and mayor candidate, is the "Eat the Rich" Killer who has been secretly killing off his friends.

Joe hunts Rhys down and accidentally kills him in episode eight. However, in a shocking twist, he realizes that Rhys was never the killer.

Due to the trauma of his past crimes, Joe has dissociated from reality all season and has imagined a version of Rhys in his head, when he is actually the killer all along.

In a new interview with GQ, Badgley said he agreed with the direction of season four, and said that it made the most sense that Joe is the ultimate villain rather than slowly becoming a hero, as hinted in the first half of season four.

"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," Badgley says. "This is the only place the show could have ever gone and remain relevant, remain responsible, remain intelligent, remain sensitive, but true."

In the season four finale, Joe is shown trying to push the imaginary Rhys — a metaphor for the dark side of himself — off a bridge, and then attempting to kill himself.

Badgley said that this was not a sign that Joe is trying to change his patterns.

"He does attempt [it]," Badgley said. "However, the bizarre logic of this show, which I think at its best works really brilliantly, is that he's not killing himself. It doesn't feel to me at all like a depiction of that. It didn't feel like that when we were making it. It didn't even feel like that when I read it."

He added: "Joe is still following the logic that he's always followed, which is, 'I'm going to kill someone to save another.' And the irony is that even in that act, he's still self-centered. I'm interested to see how people may respond to that."

Also in the interview, Badgley said that the latest season wasn't initially meant to be released in two parts and he thinks the next season, which has not been confirmed yet, may be the final season.

"I know what Greg pitched me a few years back as what he thought was the right way to end. If there's another one, it's going to be, I think, a grand finale," the "Gossip Girl" star said.

All four seasons of "You" is available on Netflix.