EastEnders shares first look as Dotty's mum arrives in Walford

EastEnders spoilers follow.

Dotty Cotton is in for a shock this week, as new first-look pictures from EastEnders show.

It was recently revealed that Dotty brought her uncle Rocky (Brian Conley) to Walford to pose as Sonia Fowler's father in order to con her out of Dot Cotton's inheritance money. Last week (September 23), Sonia shared the news with Kathy that she planned to invest in her father's business, playing into Dotty's plan.

Kieron McCarron/Jack Barnes//BBC

But in next Tuesday (October 5)'s episode, things look like they could derail for Dotty when a familiar face shows up. Following a successful relaunch at Ruby's, Dotty's riding high – until her mum arrives.

New images from EastEnders show Sandy Gibson (Martha Cope)'s arrival, with her ready to cause havoc in Walford.

Sandy last appeared on the square in February 2010 (played by Caroline Pegg at the time), when she sensationally arrived in Dotty's life, despite her daughter believing she was dead – her father Nick Cotton had told her Sandy had been killed in a car crash.

Kieron McCarron/Jack Barnes//BBC

Last week saw Dotty call Rocky (aka her uncle Thomas Cotton) to the club to discuss their plan, but was put off when he started having second thoughts about ripping off Sonia.

"You were in a gutter, Uncle Tom," she reminded him. "I saved you, and I brought you here. It wasn't to play conkers. You're not her dad!"

When Tom hit out at his niece for having "a very cruel tone", Dotty warned her uncle to "pick up [his] game" because she isn't the one with "anything to lose" by telling Sonia and Kathy.

Viewers will have to wait until October 5 to find out whether or not Sandy will unmask Dotty and Rocky's scheme and derail their plans.

EastEnders airs on Mondays, Tuesdays, Thursdays and Fridays on BBC One.