Arnold organizes a campaign to save the oldest tree in the neighborhood. Mr. Simmons is accepted by Arnold and the rest of the class as their new teacher after they're tormented by a mean substitute.

The big Bike-a-Thon is coming. And with everyone getting ready, Gerald is afraid his friends will learn his humiliating secret. Can Arnold put the brakes on the rumors?

Arnold and Helga are editors of competing school newspapers.Harold softens when he finds a lost cat and then refuses to give it up to its rightful owner. Arnold eventually persuades Harold to give up the kitty.

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.

After being scratched by an organ grinder's monkey, Helga is convinced her days are numbered.Arnold and Gerald attempt to catch the biggest fish in the city pond.

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!

After Arnold saves Sid from injury, Sid devotes himself to paying Arnold back with unending kindness. Arnold and Gerald play hookey but their day is thwarted by intense paranoia.

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.

Arnold struggles to rally his peers during a football match against the fifth-graders; Gerald finds his newfound freedom to be overrated.

Gerald gets in over his financial head selling a sure-fire product.

Arnold tries to help his grandfather redeem himself for a past embarrassment by entering into a Chinese Checkers tournament against a former rival.

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.

When Helga chooses Phoebe as her replacement for Hall Monitor, she teaches Phoebe how to enforce the rules a little too well. Harold becomes increasingly nervous as he prepares for his Bar Mitzvah.

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.

Eugene becomes disillusioned about his life after learning that his favorite movie action hero doesn't do his own stunts. Arnold and the gang go on a class trip to the opera and have grand, musical dreams of their own.

After happening upon a snotty rich kid named, Rex, who is legendary for winning the annual toy boat race, Arnold and Gerald decide to enter the race. Fed up with Principal Wartz's budget cuts, the teachers decide to go out on strike.

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.

First the great composing team of Spumoni and Reynolds split up. And now maybe Arnold and Gerald, too. Are all great performing duo doomed?