This is a list of episodes from the series Hey Arnold!, which ran from October 1996 to June 2004 with 100 episodes and a movie overall.
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Downtown as Fruits / Eugene's Bike: Arnold and his Black Best Friend, Gerald, ditch the school play (directed by Helga Pataki, a female bully who's secretly in love with Arnold) and go to the bad side of the city in their fruit costumes, where the duo are given a sackful of money by a seedy man who thinks they're criminals waiting for their cut; Arnold cheers up a nerd with a nasty streak of bad luck after his bike gets wrecked in a freak accident.
The Little Pink Book / Field Trip: Helga loses her journal, which is filled with love poems about Arnold; after a field trip to the aquarium, Arnold and his demented grandmother break in to free a sea turtle who's been in captivity for a long time.
Arnold's Hat / Stoop Kid: Arnold loses his baseball cap; Arnold helps an abandoned teenager (voiced by Danny Cooksey) venture away from the stoop he calls home.
Helga's Makeover / The Old Building: When Rhonda doesn't invite Helga to her party because she isn't girly enough, Helga decides to prove her wrong; Arnold is torn between helping Ernie destroy an old theater and helping his grandma save it.
6th Grade Girls / The Baseball
Heat / Snow: The kids go insane during a heat wave; Arnold tries to enjoy a snow day, but his grandfather wants him to do chores.
Operation Ruthless / The Vacant Lot: In "Operation Ruthless," Arnold tries to get close to a sixth grade girl named Ruth MacDougal at a carnival, and Helga tries to break up Arnold and Ruth.
The List / Haunted Train: Everything on Arnold's list for a perfect Saturday goes wrong in some way;
Mugged / Roughin' It: Arnold takes karate lessons after a petty thug robs him on the bus;
Door #16 / Arnold as Cupid
Benchwarmer / Cool Jerk
Das Subway / Wheezin' Ed: Arnold, Gerald, Phoebe, Harold, and Helga get stuck on a subway car with an old blind man, a claustrophobic and her therapist, and a bum; the kids venture into a cave said to be haunted by a wheezing gangster.
Tutoring Torvald / Gerald Comes Over: Arnold tutors an underachieving teenager who's been held back in the fourth grade;
Spelling Bee / Pigeon Man: Arnold competes in a spelling bee to win money for a keyboard while Helga is forced to compete in a spelling bee by her father, who wants her to be like her older sister, Olga; Arnold meets a homeless man who lives on the roof of an old abandoned building and cares for pigeons.
Arnold's Christmas: It's Christmas in the city. While Helga goes searching for the perfect Christmas gift for her crush, Arnold helps his neighbor, Mr. Hyunh find the daughter he gave to a helicopter pilot during the Fall of Saigon.
Olga Comes Home / Sally's Comet: Olga, Helga's perky, perfect, college-aged sister, comes home for college break and Helga turns her into an emotional wreck by planting a "B+" in her straight-A report card; Arnold and Gerald try to make everyone in the city turn off their lights so they can see Sally's Comet.
Abner Come Home / The Sewer King
False Alarm / World Records: Eugene is accused of pulling the school fire alarm; Arnold rallies the town into helping him break a world record.
Magic Show / 24 Hours to Live: Arnold chooses Helga to be an assistant for a magic trick, but an accident sends Helga into an alternate universe where she's never born and everyone is better off without her; Arnold accidentally angers school bully Harold and is challenged to fight him.
Arnold's Valentine: Arnold sets up a date with his crush, Ruth MacDougal on the same night he's supposed to meet his French pen pal. Meanwhile, Helga poses as Arnold's French pen pal so she can once again steal Arnold away from Ruth.
Save the Tree / New Teacher: Arnold and his friends attempt to save "Mighty Pete", the oldest living tree in their neighborhood; Arnold's 4th grade class gets a new teacher after Miss Slovak resigns.
Helga's Love Potion / Gerald's Secret
The Big Scoop / Harold's Kitty
Longest Monday / Eugene's Pet
Monkey Business / Big Caesar
Ransom / Ms. Perfect: Timberly's stuffed toy goes missing, so Arnold and Gerald play detective to find out who stole it; Lila is the new girl and the other girls hate her upstaging them, but they still feel guilty after playing tricks on her.
Arnold Saves Sid / Hookey
Freeze Frame / Phoebe Cheats: Arnold and Gerald think they've found a conspiracy to do with a planned crime; Phoebe copies a poem out of a book to win the poetry contest, but her conscience is haunted in the form of her prize - a statue.
Mudbowl / Gerald Moves Out: Arnold and the other 4th graders play an American football game against Wolfgang and the other 5th graders; Gerald becomes tired of dealing with his family's antics and moves into the boarding house.
The High Life / Best Friends: Gerald gets rich quick selling cheap watches;
Steely Phil / Quantity Time: Arnold's grandpa competes in a Chinese checkers match; Helga's dad clumsily tries to bond with Helga.
Eating Contest / Rhonda's Glasses: Arnold trains to compete in an eating contest; Rhonda becomes an outcast after the optometrist prescribes her glasses for her poor eyesight.
Helga's Boyfriend / Crush on Teacher: Helga hires Stinky to be her boyfriend to make Arnold jealous; Arnold develops a crush on his substitute teacher.
Hall Monitor / Harold's Bar Mitzvah: Phoebe is assigned hall monitor and, under Helga's tutelage, becomes a jerk; Harold runs away after learning that his bar mitzvah is his rite of passage into manhood.
Coach Wittenberg / Four-Eyed Jack
Eugene Goes Bad / What's Opera, Arnold?: Eugene becomes a bad kid after learning his favorite action star called "The Abdicator" is a wimp; Arnold's love life is reimagined as the Bizet opera, Carmen.
Tour de Pond / Teacher's Strike: Arnold competes in a toy boat race; the kids celebrate when school is called off due to a teacher's strike.
Runaway Float / Partners
Helga Blabs It All / Harold the Butcher: While under the influence of laughing gas from the dentist, Helga lets it slip that she's madly in love with Arnold; Harold gets a job as a butcher's assistant after getting caught stealing ham (which Harold can't eat anyway, since he's Jewish).
Dangerous Lumber / Mr. Hyunh Goes Country: Arnold thinks his baseball bat is cursed; Mr. Hyunh becomes a country singer.
Casa Paradiso / Gerald's Tonsils: Grandpa decides to sell the boarding house and live in an upscale retirement home; Gerald's singing voice is compromised after a tonsillectomy.
Arnold's Room / Helga vs. Big Patty: Sid pretends to Lorenzo that Arnold's room is his room; After Helga gets caught making mean jokes about Patty, she is threatened.
Stinky Goes Hollywood / Olga Gets Engaged: Stinky is chosen as the new spokesman for Yahoo Soda, and discovers that the executives only like Stinky because he's a stupid hick; Helga discovers that Olga's new fiance is using her.
Curly Snaps / Preteen Scream: The ball monitor job at recess was mistakenly given to Sid, so Curly steals all of the school's kickballs and takes over Principal Wartz's office; Phoebe meets a famous star singer named Ronnie Matthews.
Grandpa's Birthday / Road Trip: Arnold's grandpa thinks he's going to die on his birthday; Miriam tries to bond with Helga while on a road trip.
Sid's Revenge / Roller Coaster: Sid uses voodoo on Principal Wartz after he is punished for something he didn't do then fears he killed the principal; Arnold and Eugene get stuck at the top of a roller coaster.
The Aptitude Test / Oskar Gets a Job: Helga's and Harold's aptitude test results get switched; Oskar, a freeloading, Eastern European boarder, gets a job as a paper delivery man.
Arnold Betrays Iggy / Helga and the Nanny: Arnold accidently tells his classmates Iggy's secret, so now he tries everything in his might to get Iggy's forgiveness; Helga gets a new Nanny, which she wants to get rid of.
Career Day / Hey Harold!
Best Man / Cool Party
Arnold and Lila / Grand Prix
Helga's Show / The Flood: Helga is shunned by several students after her impressions of them offend them; The fourth-graders are trapped in school during a flash flood.
Part-Time Friends / Biosquare
Phoebe Takes the Fall / The Pig War
Crabby Author / Rich Kid: Arnold meets his favorite children's book author, who turns out to be a bitter, old woman who lost her childlike whimsy years ago and lives alone;
Girl Trouble / School Dance: Arnold deals with his issues regarding Helga;
School Play: After Arnold is casted as Romeo in the school play "Romeo and Juliet", Helga does everything she can to get the part of Juliet so that she has an excuse to kiss him.
Full Moon / Student Teacher
Big Gino / Jamie O. in Love
Eugene's Birthday / Stinky's Pumpkin
The Beeper Queen / Oskar Can't Read
Dinner for Four / Phoebe Skips
Helga's Parrot / Chocolate Turtles: Big Bob's parrot overhears Helga romantically gush about Arnold in her sleep, and repeats it, to Helga's chagrin; Gerald's sister Timberly eats all the Chocolate Turtles he and Arnold were going to sell, so now they must make new ones.
Love and Cheese / Weighing Harold: Arnold asks Lila out to the Cheese Festival, and Helga tries to sabotage their date;
Back to School / Egg Story: Arnold's grandpa goes back to school to get the grade school diploma he never got; Arnold and Helga are stuck with a team work assignment.
It Girl / Deconstructing Arnold: Helga is chosen to be a model and is admired for her bad-girl image; Arnold stops giving advice after several of his classmates say they don't want it when it turns out they actually need him.
Grudge Match / Polishing Rhonda: Big Bob and Grandpa play a game of golf to decide who pays for the damages when their cars crashed into each other; Rhonda goes to polishing school and is failing, so she begs help from Patty, who is taking the same class.
Weird Cousin / Baby Oskar: Arnold's cousin Arnie visits him, who everybody finds creepy; Oskar and Suzie take care of a baby named Oskar.
Grandpa's Sister / Synchronized Swimming
Helga Sleepwalks / Fighting Families
Headless Cabbie / Friday the 13th: Gerald tells the legend of the Headless Cabbie, and soon everyone believes for it to be true; Arnold and Gerald think they're stuck with bad luck and tries to appease it.
Helga on the Couch: Helga is sent to the school therapist, where she tells the tragic story of her childhood and how she first fell in love with Arnold.
Dino Checks Out: Frank Sinatra-esque crooner Dino Spumoni fakes his death so his albums can sell better, but his family and friends (who believe he's dead) are the ones reaping his fortune.
Monkeyman! / Buses, Bikes and Subways
Helga's Masquerade / Mr. Green Runs: Helga decides to act more like Lila to make Arnold like her;
Sid the Vampire Slayer / Big Sis: Sid becomes paranoid that Stinky might be a vampire; Olga becomes a big sister figure to Lila, which makes Helga jealous.
Bag of Money / Principal Simmons: Arnold, Gerald and Sid find a bag of money in a garbage can that they decide to return to the police, and Arnold holds onto it for the time being, but he loses it by a mix-up and soon Sid believes that he used up all the money that causes everyone's reliance on Arnold to falter;
New Bully on the Block / Phoebe Breaks a Leg: Arnold and his classmates deal with fifth-grader bullies who steals their vacant lot; Phoebe breaks her leg because of Helga, and keeps on faking it after getting cured so Helga can keep on doing favors for her.
Helga's Locket / Sid and Germs: Helga loses her locket with Arnold in it and it winds up in Arnold's possession, which Helga tries to get back; After seeing a documentary about the danger of germs in school, Sid becomes ridiculously germophobic.
Suspended / Ernie in Love: Harold gets himself suspended by his own free will, but realizing how boring it is, he tries to get back in to school;
Parents' Day: Arnold competes with his grandparents in a Parents Day Tournament, but soon feels torn about his parents' abandonment and feel reluctant if he should keep participiating or not;
Stuck in a Tree / Rhonda Goes Broke: Arnold, Eugene and Harold gets stuck in a tree and fear they will be there forever; Rhonda goes broke and has to deal with living at the boarding house where Arnold lives.
Beaned / Old Iron Man: Helga gets amnesia by Arnold who accidently hits her with a ball, and when she regains it, she still fakes it so she can spend time with Arnold who feels he owes her;
Arnold Visits Arnie / Chocolate Boy: Arnold visits Arnie only to discover different personality counterparts of his classmates, including Lila (Lulu) and Helga (Hilda);
Harold vs. Patty / Rich Guy: Harold gets beat by arm wrestling by Patty and gets teased about it, so he asks her for advice on how to become a better arm wrestler for the Arm Wrestling Tournament;
April Fools' Day; Arnold temporarily gets Helga blind by an April Fools Prank, but after regaining eyesight she still fakes it so Arnold will spend more time with her who feels he owes her, as well as take her to the April Fools Prom;
Gerald's Game / Fishing Trip
Married: By a marriage prediction by Rhonda, Arnold and Helga find out they will get married in the future. Having very mixed reactions to it, they wind up having a nightmare and a wonderful dream about it, respectively;
On the Lam / Family Man
The Racing Mule / Curly's Girl: The boarders buy a mule to race him and enlists Arnold's help; When Rhonda gets into trouble, Curly offers to get her out of it, but only if she pretends to be his girlfriend for a week.
The Journal: Phil reads a journal Arnold's father wrote when they were on their expeditions.
Timberly Loves Arnold / Eugene, Eugene!: Timberly develops a crush on Arnold, much to his embarrassment; the children of P.S. 18 participate in a musical with Eugene as the head star.
Ghost Bride / Gerald vs. Jamie O.: Gerald tells the legend of the Ghost Bride, and soon the tale seems to be real;
A Day in the Life of a Classroom / Big Bob's Crisis