Cathy decides to apply to be an exchange student, and is very disappointed when the family doesn't stop her.

When a handsome young forestry students movies in next door, Patty takes a sudden interest in nature.

Martin checks into the hospital the same day that Patty starts work as a candy striper.

Ross tries to patch up the quarrel between Richard and Patty.

Patty has a slight temperature and is forced to stay home from school, against her will.

Patty decides to test Richards fidelity by posing as Cathy.

Patty is the only witness to a traffic ac cident involving Richard.

Patty becomes involved in the spy business when an Interpol agent visits the Lanes.

Patty decides to give a shy girl lessons in self-confidence.

Tha Lanes don't dare give Patty their true opinion of her op art creation.

When Richard's parents go out of town, Patty invites him to stay at the Lane house, but his personality and living style clashes with everyone else's.

When Richard goes to a party without Paty, Patty decides to give a party the same night.

Patty falls for an attractive young doctor, and misunderstands his feelings for a boat as feelings for her.

Martin's brother Kenneth sets out to write his autobiography, but discovers writing a book to be more difficult than he imagined.

Patty gets a crush on her new French teacher after he makes her his test subject.

Christmas is a day away and Cathy anxiously awaits a visit from her father, only to learn that he is a prisoner in a foreign country.

When the star basketball player's parents move to Michigan, the Lanes invite him to stay with them.

In order to buy a gift for his parents wedding anniversary, Ross enters Patty's photo in a teenagers beauty contest.

Patty writes a novel presenting the viewpoint of the American teenager and immediately gets a publishing contract.

The school is putting on a lavish version of Anthony and Cleopatra. Cathy tries out for the lead, but Patty unexpectedly gets it.

Patty plays Patty and Cathy at a party, after Cathy got sick for having taken a flu shot meant for Patty.

Patty and Cathy both run for president of the Girls' League.

When Mr. Lane refuses to pay for an evening gown for Patty, she decides to go into the babysitting business.

While Patty is taking a test to determine the intelligence of today's students, the machine goes nuts and the results say Patty is a genius with a 185 I.Q.

Frankie Avalon stops by the Lane house to make a phone call, and ends up spending a short time there because the airport is fogged in.

Patty will get an extra week's allowance if she can refrain from talking for three days.

J.R. Castle leads Martin to believe that Patty and Richard are planning to elope. Acutally, they are helping Natalie plan a surprise vacation for Martin and her at the same fishing lodge where tjhey spent their honeymoon.

Martin's Aunt Pauline comes to visit.

Ross is invited to his first dance, so Patty and Cathy try to teach him about girls.

Ross tape records conversations at Patty and Cathy's slumber party's, and then blackmails them with the tape.

Cathy wants to win more friends, so she writes to Aunt Jane,a Lonely Hearts colunnist, for advice.

Richard enters Patty and Cathy's song in the Jimmy Dean Songwriter Contest. Unfortunately, Patty had copied the words from a book of poetry!!

Cathy falls in love with a foreign exchange student.

Patty become an astrologist in order to earn money to buy Natalie a birthday present.

When all the girls like the dress that Cathy made, she and Patty decide to go into business.

Martin learns that he is being transferred to Paris.

Natalie makes the mistake of leaving her cake in the church bazaar on the kitchen table unattened.

Patty and Richard decide to go steady.

Natalie Lane begins to feel unwanted and devises a plan to get even with her family for the uncaring way they have been acting.

Cathy buys a vacuum cleaner for Natalie's birthday but finds the cost is too much for her to handle.

After flunking an exam for teenagers, Patty decides to enroll in modeling school.

To increase the circulation of the school paper, Patty uses scandalous stories which infuriate the school principal.

Patty receives some beautiful letters from a new pen pal, and therefore loses interest in Richard.

In order to impress Sue Ellen, Patty buys an expensive dress that she can't afford.

Patty discovers that she is allergic to Cathy.

Patty unknowingly signs papers to adopt a Korean orphan.

Richard decide to quit school.

In order to get elected chairman of the class prom, Patty promise to get Pinky Gristol "The Mop" as a guest.

Cathy, who is student principal for a week, has trouble dealing with Patty.

Patty gets a job at the local ice cream parlor.

Patty and Cathy reminisce about Cathy's arrival in the Lane household.

Richard is jealous of Geoffrey Davis, III, a military cadet in town for a visit.