Save the Tree: Arnold and the gang must stop Big Bob from chopping down the oldest tree in town. New Teacher: After the kids scare away their new, sensitive teacher, they end up with a dictator, and have to convince the former to come back.

Helga's Love Potion: Helga drinks a potion to lose all feelings for Arnold. Gerald's Secret: Gerald confesses to Arnold that he never learned how to ride a bike, and Arnold has to train him before he competes in the Bike-a-thon. The other kids tease him about it, but Gerald eventually proves them wrong.

The Big Scoop: Helga breaks away from Arnold's school newspaper and exercises her First Amendment right to start one of her own, filled with tabloid stories instead of facts. Harold's Kitty: Harold finds a stray kitten and keeps it as his own after Arnold gets it from a garbage can. He names the kitten Cupcake since the kitten looks like one. Arnold's fliers bring the real owner back to find her lost kitten, but Harold won't give the kitten up. When Harold refuses to give Cupcake back to his rightful owner, the police come.

AKA - Trash Can Day, Arnold and Gerald must get through the traditional day of hazing 4th graders. After EugeneÃ+s pet fish is accidentally killed by ArnoldÃ+s yo-yo, Arnold vows to get unlucky Eugene a pet that will endure.

Monkey Business: Helga believes she has contacted a deadly disease after learning about it in class. Big Caesar: Arnold and Gerald try to catch Big Caesar, a prehistoric fish that is hard to believe even exists. Grandpa tells the boys about his attempt to catch Big Caesar and teaches them the ropes of fishing.

When Timberly's doll is kidnapped, Gerald and Arnold track it down. A perfect new classmate is tormented by Helga and the other girls, but is eventually accepted.

Arnold and Gerald team up to carry out the ultimate Halloween prank, by deliberately faking a news radio broadcast of an alien invasion, causing widespread panic throughout town not seen since Orson Welles inadvertently did so in 1938!

Arnold Saves Sid: When Arnold stops a board from falling on Sid, Sid feels Arnold saved his life and becomes his slave as a way to thank him, and it drives Arnold crazy. Hookey: Arnold and Gerald decide to skip school to have a good time, but they're so busy trying not to get caught that they have a terrible time and even worse, it turned out that if they had gone to school in the first place they would of enjoyed themselves with a Carnival day.

Arnold and Gerald catch a suspicious man on film and they follow him clue-to-clue.In an effort to win a class poetry contest, Phoebe copies a poem from a book. Thereafter she is haunted by her guilty conscience and the imagined voice of her trophy. Written by Anonymous

Mudbowl: Phoebe is determined to win a poetry contest, and when she can't think of anything to write, she copies a poem from a book. The statue of Emily Dickinson that she wins for her poem comes back again and again to haunt her. Gerald Moves Out: Gerald gets tired of his brother's wrestling moves, his sister ruining his stuff, his father always complaining about the electricity bill, and his mother always telling him what to do, so he rents a room at the Sunset Arms.

The High Life: Gerald tries to make money by selling Wacko Watches, but when he sells them to everyone, Gerald's stuck with a load of watches and no one to buy them. Best Friends: Arnold, Rhonda, and Nadine are grouped up for a project, but Rhonda and Nadine get into a fight whether they should do a project on fashion or an insect, and Arnold gets stuck in between their fight.

Arnold trains Grandpa to take on his old Chinese checkers nemesis, Robby Fisher.Miriam decides to visit her mother after learning that Big Bob and Helga are on vacation at the same time. Now father and daughter must spend some quantity time together. Written by Anonymous

Like his Grandfather before him, Arnold competes in the annual block party eating contest. Fashion and image-aware Rhonda fails the eye chart and gets glasses. Immediately she is labeled a geek and is forced to hang out with the geeky kids.

Helga's got a foolproof plan: Hire a boyfriend, and a jealous Arnold will surely come swooning into her arms. Presuming of course, Arnold notices.

Hall Monitor: Helga appoints Phoebe as hall monitor and teaches her how to do the job. Phoebe then becomes a stricter hall monitor than Helga. Harold's Bar Mitzvah: Harold runs away from his Bar Mitzvah, thinking he will retain his childhood this way.

Arnold and Gerald recruit their old basketball coach to be their bowling coach, and he quickly alienates them with his overbearing demandsArnold and Gerald go on a ghost hunt through the boarding house, trying to uncover the mystery of Four-Eyed Jack. Written by Anonymous

Eugene Goes Bad: Eugene finds out that his TV hero, The Abdicator, is just an overpaid, whiny Hollywood star who doesn't do his own stunts, and without a role model, Eugene decides to go bad. What's Opera, Arnold? : Mr. Packenham takes the 4th grade class on a field trip to see the opera Carmen, and while Arnold falls asleep and dreams of him and Ruth, Helga dreams of getting rid of Ruth and having Don Arnold for herself.

Tour de Pond: Arnold and Gerald enter the Tour De Pond boat race, and face competition with Rex Smythe-Higgins III, whose family has won ever since Rex's grandfather cheated and beat Arnold's Grandpa 70 years ago. Teacher's Strike: Teachers of Arnold's school go on strike because of inadequate funding; He and his friends are on cloud nine, only to find out that every lost school day will be taken from their summer vacation.

Arnold and Gerald have landed after-school jobs in Mrs. Vitello's flower shop. And everything's coming up roses...until Mrs. Viteloo decides to make one of them the boss.