It was his first major acting role, and Jamie Dornan has admitted he was lucky to be cast in The Fall because he had so little on-screen experience.
The actor (33), who has since shot to fame globally after starring in Fifty Shades of Grey, said BBC bosses took a big gamble when they cast him as creepy serial killer Paul Spector in the drama.
"I definitely hadn't done enough work, really, to warrant being given that opportunity," he said.
"I'd never even done a small part in a BBC production, never mind being given a lead in one.
"I'd never done British television of any kind.
"It was a big punt for them to take on me.
"It automatically did wonders for how comfortable I felt early on, knowing that the driving force behind it all believed I was the guy."
Although the show's creators had his back, the father-of-one was still lacking confidence after reading through the script in front of the crew before filming started.
"During the table-read I was like, 'I'm packing my bags, this isn't going to happen'," he told entertainment site Variety.
Although he has carved out a career for himself as a serious actor, Dornan recently admitted to avoiding social media to stop fame from going to his head.
"The fame doesn't feel that palpable until you're online, so I'm actively trying to avoid social media at the moment," he said.