In which TV series is Norm Peterson a main character?

Who played Sam Malone in 'Cheers'? Who played Diane Chambers in 'Cheers'? In which TV series is Diane Chambers a main character? Who played Norm Peterson in 'Cheers'? Who played Cliff Clavin in 'Cheers'? In which TV series is Cliff Clavin a main character? Who played Carla Tortelli in 'Cheers'? In which TV series is Alex P. Keaton a main character?