Watch a sneak peek from the musical episode.
So which musical is going to get theRiverdaletreatment this year?American Psycho!
EW has an exclusive clip from the episode below.

Caroline Day, Erinn Westbrook, Madelaine Petsch, Camila Mendes, Lili Reinhart, Vanessa Morgan, and Sophia Tatum on ‘Riverdale’.Colin Bentley/The CW
(He wrote the book, with music and lyrics by Duncan Sheik.)
ROBERTO AGUIRRE-SACASA:In real life, there are true-crime conventions and there’s something called CrimeCon.
So it came out of that real-world phenomenon.
And people were like, “I don’t think so.”
So it started from there.
Honestly, it does make sense forRiverdale.
How did you all decide onAmerican Psycho?
What if we combine our big serial killer fan convention with a musical?"
And then from, it was like, “What are the serial killer musicals out there?”
There are actually some, but it felt like the most apropos wasAmerican Psycho.
There is a line in the episode aboutSweeney Todd.
Was that the runner-up?
We talked aboutSweeney Todd; we talked aboutAssassins.
We talked about shows like that.
I loveSweeney Toddbut it almost feels too old-fashioned forRiverdale.
But by the way, in an upcoming episode, we actually have a Sondheim number.
But that would’ve been our runner-up, for sure.
What’s the importance of this episode for Betty as we get back to the TBK story?
I think she’s been haunted by TBK since the time jump.
And as always with Betty, we’re excavating these themes of darkness that she’s wrestled with.
We’ve learned about her being groomed to be a serial killer.
In a weird way, this episode is a love triangle of Betty, TBK, and Archie.
And does Betty see herself more aligned with someone like TBK or someone like Archie?
So it felt a little bit also like aBeauty and the Beaststory.
As we head toward the end of this season, is Rivervale coming into play more and more?
The answer is yes.
[Laughs] And Cole loves it, by the way, he really loves this kind of stuff.
I told him, “Man, you and the bunker is gold.”
And he’s happy playing it.
Who knew that the bunker would survive as long as it has?
This interview has been edited for length and clarity.
Riverdaleairs Sundays at 8 p.m. ET/PT on The CW.