I have to disagree. In many circles, they are much more influential than Shatner.

Sure Shatner does TV ads and happens to have zepplin like body type, but does price line have a blimp named after him?

and of course there's the influence on Psychiatry of Lucy, The popularization of Beethoven by Schroeder, and the invention of the "Santa Claus of Halloween", the immortal Great Pumpkin. Not to mention a popular song and the only Christmas classic based upon real events of The Great War.   

Yeah, Shatner is influential, AND he has a huge round head, Good Grief! He even PLAYED a big giant head! But he is no Charlie Brown.