In which TV series is Sydney Bristow a main character?

In which TV series is Turk a main character? Who played Dr. Perry Cox in 'Scrubs'? In which TV series is Dr. Perry Cox a main character? Who played Sydney Bristow in 'Alias'? Who played Clark Kent in 'Smallville'? In which TV series is Clark Kent a main character? Who played Lizzie McGuire in 'Lizzie McGuire'? Who played Jimmy McNulty in 'The Wire'?