Who played Dylan McKay in 'Beverly Hills, 90210'?

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'? In which TV series is Brenda Walsh a main character? 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'? Who played Al Borland in 'Home Improvement'?