cherrios

What is the first episode that Bobby makes his first appearance?

I love how protective he is of the boys, especially Dean. Bobby sees what Dean does for his family every day, and wishes the boy would take better care of himself.

I think Bobby sees the boys as the family he never had or maybe lost. Hunters seem to live very lonely lives, not many of them have families. It seems that either they lost their family to evil and that's why they started hunting. Or it's such a lonely career they can't settle down anywhere.

I would like to know more about Bobby's background.