The shocking moment at the end of tonight's show has sparked a fierce debate over the identity of man in the mask.
Mick was jumped from behind by a thug in a balaclava and they were seen wrestling as the credits rolled.
Fans flocked to Twitter to share their ideas about who is responsible for the vicious attack.
Many have offered up some good guesses while others have gone for some more unusual suspects.
A lot of viewers are convinced it one of Aidan's thugs, proving the New Year's heist drama involving the Irish villain is far from other.
They say a HUGE clue is that a someone has been stalking Mick from a car with blacked-out windows, fuelling speculation if could be Aidan lurking behind the tinted glass.
Others fear Mick's attack could be linked to Callum 'Halfway' Highway, who is acting strangely since recently returning to Walford.
Fans think it could a dodgy mate of Halfway, who has turned up to rip off the Carters, or even his brother who has headed to the Square.
However, they are some more other suspects include recently departed Vincent and even long gone Grant Mitchell.
One even suggested that Steve Owen might have come back from the dead.
A fan wrote: "#Eastenders please let it be Grant 😢."
Another added: "No doubt that was Halfwits brother strangling Mick #EastEnders."
A third tweeted: "The guy in the balaclava is that guy who didn't turn up for Halfwit's party the other day. Not an actual "bad guy". #EastEnders."
One more stated: "#EastEnders i bet it's Steve Owen back from the dead."
Another commented: "Please let it be Grant."
The shock assault happened when Mick went down to investigate a strange noise in the barrel store.
Just moments after he arrived in the cellar, he realised he was not alone as a man emerged from the shadows and tried to strangle him.
Fans will have to wait and see to find out whodunnit.
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