When Kylie (Paula Lane) tries to get her job back by blackmailing Audrey (Sue Nicholls) with the footage she recorded of Marcia, the salon boss refuses to give into her demands but secretly panics.
Later, as Marc (Andrew Hall) hears what's going on, he wonders whether he should just tell everyone about Marcia before Kylie gets a chance to - but Audrey won't hear of it and insists that the street's tearaway is just bluffing.
However, Marc's mind is made up and after inviting Audrey, Gail and Sally out for a drink that evening, he walks into the pub dressed as Marcia - leaving everyone stunned. Will he live to regret his bold move?
Coronation Street airs tonight at 7.30pm and 8.30pm on ITV1.
> Read our spoiler for the first episode of tonight's Coronation Street double bill
> Read our spoiler for the second episode of tonight's Coronation Street double bill
> Read more Coronation Street spoilers and news