Nicholas, who was filming for 2010 flick Clash of the Titans when the audition took place, said: “I had long hair extensions.
“They gave me a ponytail and also a very patchy fake tan.”
“So I remember being like, ‘This is probably not what they’re hoping for’, and it obviously wasn’t.”
Nicholas recalled, “I auditioned for the pilot. I had no idea what Game of Thrones was.”
“Didn’t get it. Kind of forgot about it.”
Nicholas is currently promoting his new big screen biopic, Tolkien which he plays the famed Lord of the Rings author.
Lily Collins stars as the writer’s romantic muse and future wife Edith Bratt.
The film echoes Tolkien and Bratt’s real-life love story. They met and fell in love when the author was just 16 and she was three years his senior.