Mark Charnock has promised that viewers can expect plenty of shocks and surprises where Marlon and Donna are concerned.
"Donna has got massive stuff coming up with Marlon, April and other characters," the actor said. "The angles that the story takes are genuinely shocking. When I first heard about them, I had my mouth open with shock. I don't think the audience has seen anything like this for a long while. Some of the stuff coming up is genuinely jaw dropping and it's very exciting to be part of it."
Next week's episodes of Emmerdale will see Marlon finally recognise just how much he wants to be a part of daughter April's life. As he sees Donna packing up the car and preparing to leave, the Woolpack chef makes a far-reaching decision:
"Beforehand, Marlon says that he doesn't think he'll ever be ready for this situation with Donna at the centre of it. But then he sees them packing the car and April says 'Daddy' and runs over to him," says Charnock. "Marlon thinks that April is going to leave thinking for the rest of her life that he's a monster and an awful human being, He steps in front of the car and stops them from going."
And it's this impromptu move that eventually leads to some much needed bonding between Marlon and the daughter he only recently discovered was his. "When Marlon steps in front of the car, Donna bangs her head. She's woozy from bumping her head and goes for a check-up at the hospital, so Marlon offers to look after April.
"What follows are some funny scenes where Marlon and April make no progress whatsoever in terms of hitting it off. It's the first time Marlon has been with his daughter, but it's a disaster and she doesn't want to know him. But he wins her round the following day and he's thrilled."
Yet despite what looks to be a rapprochement, it seems that viewers shouldn't get too used to having Donna back on screen. Actress Verity Rushworth - who returned to the ITV soap last month after a five-year break - recently revealed that she's around for a limited period only:
I'm back for five months. The storyline was too good to turn down and there are lots of twists and turns. I'm not going to give away the ending, but there's plenty of high drama. But I think I'm definitely just going to be here for the five months."