Who is Stranger from Welcome to the Monkey House and what is their importance?

The stranger is also an old man, trying to sit and read his book. He tries to politely avoid Bullard and his dog, but to no avail. He even tries to leave and sit somewhere else, but they follow him. Finally, he is driven to tell his story, perhaps because he needs to get it out at last—or perhaps because he wants to get rid of Bullard. He seems educated and dignified, and ultimately kind-hearted. He is now independently wealthy and has been his whole life, because of the stock market tip Edison's dog Sparky gave him.