In which TV series is Brenda Walsh a main character?

Who played C.J. Parker in 'Baywatch'? In which TV series is C.J. Parker a main character? Who played Dale Cooper in 'Twin Peaks'? Who played Brenda Walsh in 'Beverly Hills, 90210'? Who played Dylan McKay in 'Beverly Hills, 90210'? Who played Philip Banks in 'The Fresh Prince of Bel-Air'? Who played Carlton Banks in 'The Fresh Prince of Bel-Air'? Who played Tim "The Tool Man" Taylor in 'Home Improvement'?