Grandpa's sister, Mitzi, shows up out of the blue to grace the boarding house with her presence./When Coach Wittenberg needs to form a synchronized swim team to save his job, he recruits Arnold, Gerald and the rest of the gang to compete.
Arnold's weird cousin, Arnie, arrives for a visit and appears to be the biggest loser to everyone except Lila, the love of Arnold's life. / Oskar's wife Susie agrees to watch her cousin's baby, also named Oskar.
When Arnold and Grandpa get into a fender bender with Helga and Big Bob, the typical argument of who's at fault ensues./After a confrontation at PS 118 between Rhonda and Patty, they both end up at the same finishing school.
Grandpa returns back to grade school so he can finally fulfill his dream of graduating./Mr. Simmons gives the class an assignment to couple up and take care of an egg over the weekend to learn teamwork and responsibility.
Big Bob gets a parrot which eventually gets on his nerves. He passes the bird on to Helga, who spills her emotions about Arnold to the bird. / Arnold and Gerald decide to sell chocolate turtles to raise money for the club's ongoing go-cart project.
Phoebe agrees to take a dive so that Helga can win a competition, but she comes to regret her decision. / The boys engage in a recreation of a historical battle, only this time their prized pig is in danger of losing his life.
Grandpa becomes tired of dealing with the boarding house and decides to sell. Arnold has to convince him otherwise. / Gerald has his tonsils removed before a big concert and must come to grips with the fact that his voice has changed.
All the kids are paired with adults with interesting jobs except Arnold, who is forced to spend time with the Jolly Olly Man. / Harold believes it's his life's calling to become a butcher, but he slowly drives Mr. Greene, the butcher, crazy.
When Arnold discovers that Oskar has been pretending to know how to read, Arnold confronts him. / Big Bob pulls his back and cannot go to a very important meeting. Not knowing who else to send in his place, he asks Helga.
Arnold becomes a hot (and dangerous) hitter. He keeps injuring people everytime he swings the bat. Afraid of hurting more people, Arnold refuses to play ball. / Arnold & Gerald manage the career of the most unlikely country-and-western singer, Mr. Hyunh.
Arnold is the cause of two birthday party's for Eugene being a big flop. / Stinky feels that he is a failure at everything he does until Arnold helps him discover that he is the best pumpkin grower in town.
While feeling the effects of laughing gas, Helga leaves a confessional message of love on Arnold's phone machine. / After Harold shoplifts some meat from the butcher shop, he is sentenced to work off his punishment.
Sid gets in over his head when doing business with the local kid loan shark, Big Gino. / Gerald's big brother, Jamie O, falls for a girl and suddenly turns nice to his kid brother.
Stinky's simple life changes after he becomes the surprise new spokesman for Ya-Hoo Soda. / Olga brings home her surprise fiancee who wins over everyone except Helga.
Curly gets enraged after a minor playground mix-up. He locks himself in the principal's office and refuses to come out. / Phoebe has a secret crush on a pop star.
After the results of an aptitude test are announced, Harold gains self-confidence and Helga feels dumber. / Arnold is instrumental in persuading Oskar to actually get off his butt and get a temporary job.
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