Viewers will see the first appearance of Kellie Bright as Linda on December 19, when Tina and Shirley pay a visit to Mick's pub.
It's bad timing for the siblings as Mick is out and Linda doesn't give them a warm welcome, rejecting a suggestion that they should all spend Christmas together.
As an argument breaks out, it's revealed that Shirley (Linda Henry) was responsible for an accident that burnt down Linda and Mick's pub 15 years ago.
Shirley and Mick haven't spoken to each other since, so Linda's hesitance is understandable.
When Shirley and Tina (Luisa Bradshaw-White) finally tire of Linda's insults, they head back to Walford - where Tina reveals that she has secretly stolen some raffle takings from the pub…
As most fans will know by now, Danny Dyer has been cast in the role of Mick and will make his own debut on December 25 when the Carter clan take over at the Queen Vic.
EastEnders airs the above scenes on Thursday, December 19 at 7.30pm on BBC One.
Digital Spy Soap Scoop video - press play below for gossip on new Platt family twists in Coronation Street, changes for The Vic in EastEnders, another shock moment of violence in Emmerdale and Sienna's comeuppance in Hollyoaks.