Four aliens have taken on the human form and traveled to Earth in order to find out how humans live and what they do.

The whole crew gets ill after Tommy catches a bug while kissing a girl.

For the first time, Dick gets confronted with his age when he's introduced to the concept of birthdays.

Sally has her very first date and Tommy starts going to high school.

Dick takes up smoking and meanwhile Sally doesn't like to be overruled by Dick all the time.

An old boyfriend of Dr. Albright shows up and Dick experiences what jealousy is.

Dick feels very lonely because Dr. Albright is on holiday.

An obnoxious professor dies and his will says he wants Dick to speak at his funeral.

Dick doesn't want the family to always irritate each other and thinks they can learn from observing Dr. Albright and her brother Roy.

Dick finds out people sometimes lie to get what they want and Sally and Harry find out how hard it is to get a driver's license.

After failing everything he has tried so far, Harry turns out to be a good painter.

The Solomons have their first experience with snow and act appropriately, or so they think.

Dick wants the Solomons to meet the neighbors.

Sally and Harry get a job and Dick feels kept out when he can't come to Dr. Albright and Nina's women-only study group.

The Solomons come to realize they don't belong to any ethnic group. Sally meets Mr. Randell.

The Solomons' car radio is stolen and Dick is being robbed. Dick pushes Tommy to take up basketball. Sally meets Officer Don for the first time.

Harry acts upset and even a bit rebellious and Dick figures Harry needs a father figure. Sally meets Mr. Randell's mother.

Dick is devastated when Dr. Albright gets a new office.

Mary has finally agreed to go on a date with Dick.