His wife abandoned him for the dwarf who drove their wedding limousine. Charlie's reaction is to suck in all the pain and abuse. He becomes a laughingstock and a doormat in his community. When he can stand no more, he explodes. Charlie is sweet, gentle, meek.
Hank is coarse, violent, aggressive.
Like Mr. Hyde, he can appear every time Charlie finds himself under extreme stress. Charlie must escort Irene to another town where she is, in fact, being sought as a material witness in a case involving wide-scale political corruption and murder. Irene is a target. Of course, all that is just a hook on which to hang a few astonishing comic inventions. Charlie and Irene come across an injured cow lying in the road.