The twist in the new Halloween trailer has been 40 years in the making.

Lock all the doors and check under your bed, because Michael Meyers is back and this time around he’s even more stabb-y, killer-y, and erm, mask-y than ever.

You see, the Halloween franchise that collectively freaked you out during all those high school sleepovers, is getting a reboot.

Set in the present day, the 11th movie in the franchise marks its 40th anniversary.

Jamie Lee Curtis will be returning to the series to reprise her role as Laurie Strode. Even Nick Castle, the original Michael Myers, will have a limited role in the movie.

But there will be one noticeable difference in the 11th film – Laurie and Michael are no longer siblings.

The Halloween twist 40 years in the making… 

Yep, this new reboot will basically wipe out the last nine movies in the series.

The story will pick up in 2018, where Laurie is now a grandmother and Michael has spent the last 40 years incarcerated.

And one single line of dialogue will change everything we thought we knew about Laurie Strode and the masked man who keeps trying to kill her.

Lemme break it down for you…

In the trailer, a group of teenagers are walking along a suburban street.

“Your grandmother is Laurie Strode,” says one girl in a group. “She was almost murdered.”

“Wasn’t it her brother who murdered all those babysitters?” asks their male friend.

“No,” says the third… Laurie’s granddaughter.

“It was not her brother. That’s something that people made up.”

Yep.

Assuming this isn’t just a lie Laurie told her granddaughter in order to protect her – this one line basically erases everything we’ve learnt from the last nine movies.

“It picks up after the first one, but it’s sort of an alternate reality,”Co-writer Danny McBride told DigitalSpy. “It’s as if the first Halloween ended in a slightly different way.”

While the original movie ended with Myers vanishing in his trademark Michael Myers way, in this version it appears the police caught him and locked him behind bars.

And if what Laurie’s granddaughters says is true – this movie will probably explore the alternative reason for why Myers is so damn hellbent on killing Laurie.

Anywho, if there’s one thing we know for sure this probably isn’t the last time we’ll see Michael Myers.

He’ll come back… he always comes back.

The Halloween reboot will be out in cinemas in October, you know, just in time for Halloween.