Emmerdale's Al rumbled by Marlon Dingle as he spots love rat with Debbie

Al Chapman's cheating scandal appears to have been rumbled by an unlikely source on Emmerdale.

Well, it was a bit inevitable, wasn't it?

For the last month or so, Al has been sneaking around fiancée Priya's back with a mystery woman, who was revealed to be Debbie Dingle.

Al first met Debbie up in Scotland after she left the Dales to set up her own garage.

Al Chapman's love rat ways appear to have been rumbled on Emmerdale (ITV)

However, much to Al's horror, Debbie returned to Emmerdale as she attempted to straighten things out with her wayward daughter.

Al tried desperately to keep Debbie and Priya from bumping into one another... but will they discover the truth after Marlon saw Debbie and Al's intimate chat?

Debbie was seen chatting to Al in Emmerdale (ITV)

Marlon caught a glimpse of their conversation - has he figured it out? (ITV)

Meanwhile, teen Sarah had run away from home after dropping a packet of drugs into the vicar's son's pocket to cover for her drug dealer love interest.

Sarah had hidden away from her family with Danny, played by Louis Healey, but was discovered in a compromising position by her mum.

Eventually, Debbie managed to get the truth out of her daughter - that she had been the one to plant the drugs.

"It was me who put the drugs in that man's pocket," Sarah confessed.

Debbie Dingle returned to Emmerdale this evening (ITV)

Debbie responded: "So where did they come from? The drugs?"

"Danny and his mate," Sarah replied.

"So they were dealing," Debbie retorted.

"Trying to," Sarah said. "Only Chas called the police and I just panicked. It was really scary! But he saw me! Ethan - he knew by my face and suppose he tells the police and gets me arrested. I could go to prison like Danny!"

"You're not going to go to prison," Debbie insisted. "Listen to me, you are my priority - I'm back and I'm not going anywhere, ok?"

Fans took to Twitter to comment, with one writing: "Debbie has only been back for five minutes and she’s told about nine characters to f*** off. Welcome back, ya miserable b***h #Emmerdale."

While another gleefully tweeted: "Debbie is back and she is fuming."

A third gushed: "I’ve missed Debbie & Sarah’s scenes...... BRILLIANT performances by Charley & Katie tonight."

*Emmerdale airs weekdays at 7pm on ITV, with additional episodes at 8pm on Thursdays