Each week Mork (Robin Williams) would get himself into some kind of trouble. That was ok because he was here on Earth to learn lessons about humans and their habits and traits. At the end of each episode Mork would report back to his commander on Ork and tell him what he had learned.
The one episode that always sticks in my mind is when Mork tried to let a baby chicken go. The baby chicken as it turns out was still in egg form. Mork tosses the egg into the air and says "fly, be free." That was robin Williams in classic form.