In which TV series is Opie Taylor a main character?

Who played Ricky Ricardo in 'I Love Lucy'? Who played Ralph Kramden in 'The Honeymooners'? Who played Barney Fife in 'The Andy Griffith Show'? Who played Opie Taylor in 'The Andy Griffith Show'? Who played Jed Clampett in 'The Beverly Hillbillies'? In which TV series is Jed Clampett a main character? Who played Samantha Stephens in 'Bewitched'? In which TV series is Samantha Stephens a main character?