The series' fourth episode made a major departure from the 1997 film.

Warning: This article contains spoilers for episode 4 ofI Know What You Did Last Summer.

From the jump, Amazon’sI Know What You Did Last Summerseries had big shoes to fill.

I Know What You Did Last Summer

Madison Iseman on ‘I Know What You Did Last Summer’.Michael Desmond/Amazon Studios

The story follows a group of teenagers who hit and kill someone with their car.

They then dispose of the body, only to discover a year later that someone knows what they did.

And furthermore, someone wants to kill them for what they did.

In the 1997 film very old spoiler alert here the murderer ended up being the victim.

Sorry, that’s confusing.

It turned out that the fisherman the teens hit with their car hadn’t died like they originally thought.

Instead, he returned a year later to get revenge.

In the show, the teens don’t run over a stranger.

And then there’s a whole twist about how it’s actually not the twin they think it is.

“I wanted people to think we were maybe doing the movie,” showrunner Sara Goodman tells EW.

“Because that would be very interesting if the other zombie-ish twin was out doing things.”

But when looking at the larger picture, Goodman knew she wasn’t going that route.

“I knew who the killer was going in,” she says.

And hopefully people are going to be like, ‘Wait, what?'"

Goodman has heard a number of theories about the killer so far.

Some people think it’s Dylan [Ezekiel Goodman].

Other’s think it’s the dad or Clara [Brooke Bloom].