Kat Slater lashed out at "poor" Jean Slater after she made the shocking discovery that her husband bore a child with her cousin.
The Slater lady found out her husband had slept with her cousin and had baby Cherry, and she was completely shocked by the whole discovery.
She shouted and screamed and tore down the decorations in front of her kids, shocking the Slater clan as they tried to move the children out of the room and over to the Queen Vic for some harmless karaoke.
But people were really worried when she lashed out at poor Jean, the only person who knew for the majority of the time Hayley was pregnant, and almost drove herself completely mad to try and fix things.
Kat believed there was no one there for her to trust and went absolutely mad when she found out Jean had pretended there was nothing going on.
Things got very messy for the group
(Image: BBC / Kieron McCarron)
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But fans thought it was wrong for Kat to have a go at Jean, who had tried to stop a vulnerable young woman from hurting herself and her baby.
One viewer said: "Kat has no right to be taking it out on Jean (or Stacey for that matter) for they were merely trying to keep the peace and keep everyone happy. Poor jean having to walk around for ages with that weight and stress on her shoulders. # EastEnders"
Another said: "Kat’s anger really should be focused on Hayley and Alfie, who lied to her, not poor Jean who only did her best to keep the family together # EastEnders"
A third said: "Na Kat shouldn’t have spoken to jean like that cos jean actually had her back # Eastenders"
Another chimed in, saying: "Wait. Wait. KAT DONT U DARE TALK TO JEAN LIKE THAT. She’s been HOLDING IT DOWN for the past 3 months. APOLOGISE NOW!!!! # EastEnders"
Jean sadly suffered some unfortunate consequences
(Image: BBC / Jack Barnes)
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A fifth added: "Alfie is honestly the worst, literally making everyone else look awful and making them lie through their teeth! He’s the one that needs to go, feel sorry for Hayley, Kat and Jean getting caught up in this, all Alfie’s fault! # EastEnders
Of course, things got worse and worse when Kat got very drunk and ran over to the Queen Vic and sang some awful karaoke which was a triggering song, reminding her of her Uncle Harry who abused her when she was 13 years old.
This then got even worse when Alfie used that experience to punish Kat, as he called her "soiled" compared to his "pure" baby daughter.
From here, Stacey and Hayley tried to defend Kat, and things got ugly when Hayley shoved Alfie down the stairs, and he was left unconscious at the bottom.
Will he survive?
EastEnders continues on Boxing Day at 8.30pm on BBC1.