The telly producer says there will be drama over the festive period as Alfie's wife Kat finds out he's the father of Hayley's baby.
He told Digital Spy: "Kat is finally learning to trust Alfie, arguably foolishly, and she's not aware that Alfie carries a huge secret.
"Alfie is doing everything he can to keep that secret, but he's growing increasingly fixated with Cherry, so it's only going to take one slip-up before something sinister and dark occurs."
Viewers will also see Mick Carter get revenge on Stuart Highway.
John added: "Mick is free, but it doesn't take too long for him to work out how Linda got him out of prison.
"Disturbed by what he's already been through, it only takes one word from Stuart to lead Mick to take the ultimate revenge.
"Mel has found herself scorned by Ray and she is determined to take revenge like no other we've ever seen before.
"Pull all those things together, it's clear that someone at the end of our Christmas period is going to have a lot of blood on their hands."
Stuart, who has been branded a “psycho” by viewers, previously shot himself and blamed Mick Carter – played by Danny Dyer – in a bid to get him sent to prison.
And Ricky Champ, the actor who plays him, says he wants to see his character get his comeuppance.
He said: “I think we can safely say that [Mick] will want revenge. Stuart deserves such a kicking, doesn’t he?
“[He should be] very scared! What I will tease is that there is a bit of sadistic pleasure in Stuart being scared of Mick.
The EastEnders Christmas special – which airs for 60 minutes – kicks off on Christmas Day at 9.15pm on BBC One.
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