Who played Gollum in 'The Lord of the Rings: The Two Towers'?

Who played Gandalf in 'The Lord of the Rings: The Fellowship of the Ring'? Who played Aragorn in 'The Lord of the Rings: The Fellowship of the Ring'? Who played Legolas in 'The Lord of the Rings: The Fellowship of the Ring'? In which film is Legolas a character? Who played Katniss Everdeen in 'The Hunger Games'? Who played Bella Swan in 'Twilight'? In which film is Bella Swan a character? Who played Edward Cullen in 'Twilight'?