Knightley was invited to join the Academy of Motion Picture Arts and Sciences, among other artists in 2006. Later that year, she reprised her role as Elizabeth Swann in the second and third productions of the "Pirates of the Caribbean" series. The two sequels were conceived in 2004, with the writers Ted Elliott and Terry Rossio developing a story arc that would span both films. Filming for the projects took place in 2005; the ', released in July 2006. With the worldwide collections of $1.066 billion, it became the biggest financial hit in Knightley's career. The third instalment in the series, ', was released in May, the following year.