The clip shows that Dot Cotton thinks she's seeing ghosts, after catching a glimpse of her son Nast Nick – who she believes to be dead.
In reality, Nick is very much alive and Halloween seems the appropriate time for him to make his dramatic comeback.
How will Dot react when she discovers the truth?
We also see Lauren growing concerned that she's being followed, before being confronted with a frightening masked figure.
SEE: EASTENDERS REVEAL 'FIRST PICTURE OF LUCY BEALE'S KILLER'
Lauren chases the masked person, and rips their disguise off… But who could it be?
Speaking of his return John Altman, who plays Nick, confirmed his character was going to sink to 'harrowing' lows.
READ: HOW WILL JACQUELINE JOSSA'S PREGNANCY AFFECT EASTENDERS' LAUREN BRANNING?
He said: "Murder's been done before and I like to act new things and I haven't been disappointed.
"These are new lows even for Nick and that's all I can say."