Who played Barney Fife in 'The Andy Griffith Show'?

In what year did 'Doctor Who' premiere? In which TV series is Lucy Ricardo a main character? Who played Ricky Ricardo in 'I Love Lucy'? Who played Ralph Kramden in 'The Honeymooners'? Who played Opie Taylor in 'The Andy Griffith Show'? In which TV series is Opie Taylor a main character? Who played Jed Clampett in 'The Beverly Hillbillies'? In which TV series is Jed Clampett a main character?