What a treat for American Horror Story fans. The series co-creator Ryan Murphy revealed a Halloween surprise on Monday that will be the ultimate mind trick of this season.

Murphy tweeted on Monday that Sarah Paulson will be reprising her role as journalist Lana Winters from season 2's Asylum.

While this is major news since Lana Winters is a fan favorite character and has been Paulson at her finest in the anthology series, it might also be confusing since the actress has already been in episodes of this season since day 1.

Already in American Horror Story: Roanoke viewers were exposed to a major plot twist that revealed this season isn't really about the documentary story of the Millers, but rather a new reality series of the Millers and reenactment actors being stuck in the house for three days to capture their reaction during the period of the Blood Moon where supernatural events are said to occur.

But fans of the show can also expect yet another major plot twist that will be revealed in episode 10, the season finale.

Technically, Paulson has played two characters already in Roanoke: Shelby Miller (the reenactment version) and then Audrey Tindall (the actress who played Shelby Miller).

Audrey is still alive after last week's blood bath of an episode, but we already know that only one of the characters will survive the whole ordeal.

Sarah Paulson's ASYLUM ultimate survivor LANA WINTERS returns this season on "AHS: ROANOKE." Happy Halloween!

— Ryan Murphy (@MrRPMurphy) October 31, 2016

It could be that Audrey is killed off and then Lana Winters is reintroduced in the season finale. Maybe Lana comes to do to a piece on the events that occurred, but since this season is based in the present day, viewers would get the older Lana.

While having the same actress play multiple roles in one season may sound strange to some, this is nothing new in the world of AHS. Paulson previous played two characters last season in Hotel, Sally as well as her Murder House character Billie Dean Howard. She also played two characters in Freak Show, Bette and Dot Tattler, although they were conjoined twins.

Murphy also announced that he is working on a Murder House and Coven crossover season for the future.

American Horror Story: Roanoke airs Wednesdays at 10 p.m. ET on FX.