In which TV series is Kate Austen a main character?

Who played Abby Sciuto in 'NCIS'? In which TV series is Abby Sciuto a main character? Who played Jack Shephard in 'Lost'? Who played Kate Austen in 'Lost'? Who played John Locke in 'Lost'? In which TV series is John Locke a main character? Who played Sawyer in 'Lost'? In which TV series is Sawyer a main character?