In the M Night drama Shyamalan – which returns for a second series – the Harry Potter star plays the brother of a woman who can only function after the tragic death of her baby, when she receives a realistic replacement doll.
Rather than seeing the doll as a mere substitute, she actually believes the doll is her real child.
Grint says becoming a father to his daughter on Wednesday made him see the story differently.
He told Sky News: “It really is, this is probably the worst show to be a part of if you’ve just become a dad.
“It’s not a good publicity for parenting, I don’t think so, but it actually helped in a way… Because it’s a very unique kind of love, and it’s a very love. powerful.
« Dorothy [Grint’s character’s sister] would do anything to get Jericho [the baby] back and it really helped to figure that out and get into that kind of a head. ”
Grint announced Wednesday’s birth in his very first Instagram post in November of last year – jokingly saying he was “10 years late” on the site.
But it was really a case of a trendy delay when the actor broke a record held by Sir David Attenborough, reaching one million Instagram followers in just four hours and a minute.
Grint says he never expected to get so much attention.
“Very surprised, it’s such a powerful tool, it’s just amazing how it moves,” he said.
“And it’s amazing how active Harry Potter fans are still and even though it’s 10 years later, it is still relevant to them.
“Yeah, it’s amazing… I don’t really believe it. ”
While becoming a dad may have helped Grint identify with one of the Servant characters, he says it made him want to stay away from one of the others.
He admits, “The doll, I don’t really like being around the doll. It’s kind of a new life. ”
Grint co-star Nell Tiger Free told Sky News the doll wasn’t very popular on set with anyone, “Poor Creepy Jerry – we call him Creepy Jerry – and it’s really getting difficult.
“People talk a lot about Scary Jerry, but it’s fun to play with, to throw it at people when they’re not expecting it.
Tiger Free plays Leanne, a nanny employed at the start of the first series by grieving Dorothy to care for the doll.
It soon becomes clear that she isn’t the innocent teenager she seemed when she was hired, and by the start of the second series, the nanny and a real baby are gone.
Tiger Free says it has been difficult to shake off the character’s odd reputation.
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She explains, “I went on a date some time ago, and he said, ‘I’m so glad you’re normal’, I was like ‘What do you mean ? He was like “I was afraid you were really scary in real life.”
“I often understand that, people I just met, saying ‘I thought you were going to be really scary and weird.’
“It’s like no, it’s just pretending, I’m not magical either. ”
The second series of Servant airs on Apple TV + starting Friday, January 15.