I Know What You Did Last Summer spoilers for season 1 finale follow.
The I Know What You Did Last Summer reboot ended its first season with a bang on Friday (November 12) as audiences finally found out the identity of the brutal killer who'd been targeting the friends since they'd killed someone in a car accident the year before.
Despite recent episodes pointing towards Dylan (Ezekiel Goodman) as the killer, the Amazon Prime Video series' season 1 finale revealed that Margot (Brianne Tju) was the killer all along.
As it turns out, Margot had known that Allison (Madison Iseman) was pretending to be her twin sister Lennon since the night of the accident and was furious that Allison wouldn't confess, as well as being heartbroken that they'd killed Lennon.
By the end of the episode, however, Allison had decided to keep Margot's secret and told the police that Dylan was the killer, and the episode ended with Dylan in jail and Margot and Allison together and keeping each others' dangerous secrets – at least for now.
Speaking to Entertainment Weekly about that killer reveal, showrunner Sara Goodman explained that Margot's actions were being "driven by love" and that she justified everything because of that.
What to Read Next
"This is my f**ked up brain. I liked it being driven by love," Goodman shared.
"I said it to Brianne from the very beginning, before she knew she was the killer, I said to her, 'Everything Margot does is driven by love.' Everything. By being loved, by loving, by love, love, love. And so everything is justified in that way.
"I liked that she felt so betrayed by what Allison had done and she just wanted her to tell the truth and pay the price for what she had done. I think that was what it was. She had a nervous breakdown at USC and so she decided that that was the only solution."
With Allison choosing to blame Dylan and not Margot by the end of the episode, Goodman also noted that it meant Allison was choosing to continue living her life as Lennon going forward.
"When we talked about it in the writers' room, for sure it was, 'Okay, she's deciding who she's going to be.' That is what the decision is. It is a self-preservation and she's going to be Lennon and that's the end. And all of her identity stuff is tied up in that.
"There's obviously places to go from there. Does she love Margot? I don't know. We'll have to see. I think Margot was equally shocked."
There are still plenty of questions left unanswered by the end of season one, including the teaser that Riley (Ashley Moore) may actually still be alive, so does this mean that fans can look forward to a second season of twists and turns in the future too?
"I guess you'd have to wait and see if there's a season 2," Goodman teased. "There's a couple ways to go with it. It definitely will reveal everything about the cult though."
She continued: "When I originally did the Bible for season 1, I pitched a potential season 2 and 3. They all took place in this world. And there is a way to do a couple different time periods in the same season, because I wasn't going to not satisfy the murder story. There's no way, I hate that.
"But I also feel like these two women are now stuck in a relationship for their survival. I think a person is in prison for something he did not do. And all he has is his faith at that point. And Riley's eyes are open after being covered in honey and maybe that's a way of taking us back into what the cult belief system is and what happened in the cave that night and what their original sin was. So there's a lot of ways to go."
I Know What You Did Last Summer is available to stream now on Amazon Prime Video.
