Francis Joseph "Frank" Underwood is a fictional character and the protagonist of the Netflix web television series House of Cards, played by Kevin Spacey. He is a variation of Francis Urquhart, the protagonist of the British novel and television series House of Cards, from which the American Netflix series is adapted. He is married to Claire Underwood (Robin Wright), but also had a sexual relationship with Zoe Barnes (Kate Mara) in season 1. He made his first appearance in the series' pilot episode, "Chapter 1".