Hey Arnold!

Arnold and Gerald miss Helga's school musical, "The Four Food Groups," by skipping school, but they end up stranded downtown after accidentally riding the bus several stops too far.

Arnold accidentally damages Eugene's new bike and takes him on a fun-filled day to make up for it, believing every geek deserves a special day.

Helga accidentally leaves her pink book containing love poems about Arnold on a bus, where it is discovered by Arnold. Determined to retrieve it before he realizes the poems are from her, Helga sets out to recover the book without revealing her true feelings.

The children look forward to a field trip to the aquarium, remembering a frightening encounter with a creature named Lock Jaw from a previous visit. When they arrive, they find that Lock Jaw is not as scary as they had recalled. Arnold, noticing the turtle's neglected condition, later returns with his grandmother to set it free.

Helga, who is deeply infatuated with Arnold, takes his hat to add to her secret shrine, which she keeps hidden in her closet. However, when she sees how upset Arnold becomes without it, she ultimately decides to return it to him.

Arnold unintentionally makes Stoop Kid, a boy who has never left his stoop and is fiercely protective of it, a target of ridicule in the city. To apologize, Arnold assists Stoop Kid in facing his biggest fear: taking his first step away from his stoop.

Helga feels hurt when left out of Rhonda's slumber party, as others assume she isn't interested in what they consider a "girly" event. To challenge these assumptions, she resolves to transform herself and prove that she is just as deserving of inclusion.

Arnold is caught between his grandmother's request to help preserve an old building and Ernie's offer to assist in its demolition. Torn between loyalty and obligation, he must navigate the conflicting demands and find a way to resolve the dilemma without taking sides.

Two sixth-grade girls, upset with the way their boyfriends are treating them, decide to take Arnold and Gerald to the school dance in an attempt to make their boyfriends jealous.

Arnold is determined to attend the final game of his favorite baseball player, but he ends up with poor seating that complicates his experience.

During a citywide heatwave, Arnold has a frustrating day as he attempts various methods to find relief and cool down, but none seem to work.

As snow begins to fall on the city, Arnold looks forward to winter fun, though he must first complete his chores. After finishing them, he joins his friends for an exciting game of hockey.

At the Annual Cheese Fair, Helga attempts to prevent Arnold from getting close to Ruth, a girl he is interested in.

Arnold and his friends try to transform an abandoned lot into a baseball field, but they discover that adults have already taken over the space for their own uses.

Arnold attempts to achieve the perfect Saturday by completing every item on his ideal to-do list, but his plans face unexpected challenges.

A grandfather captivates his grandchildren by recounting a local legend about the Haunted Train. Inspired by the tale, the children decide to explore whether the spooky story holds any truth.

Arnold is mugged, which leads Grandma to teach him self-defense. As he undergoes training, he starts to enjoy the power and confidence it gives him, resulting in unintended consequences.

Grandpa, Arnold, and Gerald set out on a traditional camping trip, only for their plans to be disrupted by the arrival of Big Bob, Helga, and Phoebe, who bring high-end gear and introduce a more modern and luxurious style of outdoor recreation.

The boarders grow increasingly curious about the mysterious package Mr. Smith has received, leading to speculation about what it might contain.

After a disagreement with Suzie that results in his eviction from her room, Oskar moves in with Arnold, who makes efforts to reconcile the two.

Helga attempts to find the perfect gift for Arnold, while Arnold gets involved in a search for the missing daughter of Mr. Hyunh.

Arnold faces tension on the team due to the basketball coach's favoritism toward another player.

Arnold develops a friendship with an older, charismatic man, but soon uncovers that his new friend has a concealed criminal history involving theft.

Arnold and his friends become stranded after dark and are forced to take the subway in order to get home.

Arnold and his friends set out on an adventure to find the legendary treasure of "Wheezin' Ed" on Elk Island, encountering various challenges and uncovering clues throughout their journey.

Arnold is assigned to tutor Torvald, the most challenging and uncooperative student in his math class, in preparation for an important upcoming test.

Gerald visits Arnold's building to meet his fellow residents, providing an introduction to the community and its eccentric inhabitants.

Arnold and Helga become competitors in a school spelling bee, where they challenge each other's vocabulary and endurance.

Arnold brings his ill pigeon to a mysterious figure known as "Pigeon Man," who resides among a large group of pigeons on a rooftop.

Helga changes her sister Olga's report card to display a lower grade, intending to teach her a lesson about depending on others for success.

Arnold and Gerald try to darken the city in order to see Sally's Comet, which requires them to turn off all the lights.

Arnold sets out to track down his runaway pet pig, Abner, and reunite with him.

Arnold accidentally drops Grandpa's watch into the sewer system and teams up with Helga to retrieve it from a mysterious figure known as The Sewer King.

Eugene is put on trial in a school court for allegedly triggering the fire alarm, with the majority of the jury believing he is guilty. Arnold, however, remains unconvinced, harboring lingering doubts about the case.

The children attempt to break world records by participating in extreme challenges, such as riding a one-person bike with multiple passengers and playing the longest game of Crack-The-Whip.

Arnold hosts a magic show and performs a disappearing act, using Helga as the volunteer. Thinking she's playing a trick, Helga vanishes and later bumps into a pole, leading her to experience a dreamlike vision of a world without her.

Arnold accidentally strikes Harold with a baseball, prompting Harold to swear revenge and challenge Arnold to a confrontation the next day.

On Valentine's Day, Arnold arranges two dates—one with Ruth and another with what he believes to be his French pen pal, Cecile—only to discover that Helga is the one impersonating Cecile, and in the process, he uncovers unexpected truths about Ruth.