As Erica and Doug's wedding day nears, the problems are piling up in Sunday's Fair City on RTÉ One and the RTÉ Player.
Erica disapproves of Doug's decision to ask Nikki to be his 'best man' - and in Sunday's trailer, Seán has some news for Doug.
"I was talking to Erica. She asked me to step in, be the best man," Seán explains.
As Doug tries to take in the news, Seán continues: "Look, no offence, Doug, but I said no. I live with Nikki and I know how thrilled she is that you asked her."
"Erica had no right to do that," says Doug. "Imagine if I told her who she could have as a bridesmaid?! She'd flip!"
"Yeah, I'm staying out of it," says Seán.
"No, no, no - it's alright, Seán. Nikki's 'best man' and that's that," says Doug.
Fans can watch what happens next on Sunday on RTÉ One and the RTÉ Player at 8:00pm.
