Actress Felicity Jones has let it slip she is set to portray comic book villain Black Cat in The Amazing Spider-Man 2.

In an interview with the London View, the Doctor Who star has revealed she has been cast to play the Green Goblin's girlfriend in the sequel - a character that was not previously confirmed.

She says, "It's all quite shrouded in secrecy, but I'm the Goblin's girlfriend. I'm in a relationship with him, and his accomplice. I'm on the dark side."

But Jones stopped short of naming her character, adding, "It's all in the vaults of Marvel. I love all that secrecy, I think it's great. It builds anticipation, there's too much transparency in everything these days."