Skarsgard plays Pennywise the clown in the hit movie, which has conquered box offices worldwide for the last two weekends.
“There was a scene we shot that was a flashback from the 1600s, before Pennywise [was Pennywise],” he told Variety’s Playback podcast.
“The scene turned out really, really disturbing. And I’m not the clown. I look more like myself.
“It’s very disturbing, and sort of a backstory for what IT is, or where Pennywise came from.”
He added: “That might be something worth exploring in the second one.

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“The idea is the IT entity was dormant for thousands and thousands of years. The [flashback] scene hints on that. “
The film is based on Stephen King’s novel of the same name, although even King himself was scared senseless by one particular moment.
“The first email he sent to Andy when he had seen the movie, the one fear he wrote back, he said, ‘I f***ing love the woman in the painting, it scared the s**t out of me’,” producer Barbara Muschietti told Collider.
She added: “We haven’t physically met him yet and we’re dying to, like just to a coffee, anything.”
Skarsgard will return for a sequel, expected in 2019.
It is out now.