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: ; 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 his boarding house and cares for the 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 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
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
Arnold Saves Sid / Hookey
Freeze Frame / Phoebe Cheats
Mudbowl / Gerald Moves Out
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
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 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
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
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
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
Career Day / Hey Harold!
Best Man / Cool Party
Arnold and Lila / Grand Prix
Helga's Show / The 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
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
Love and Cheese / Weighing Harold
Back to School / Egg Story
It Girl / Deconstructing Arnold
Grudge Match / Polishing Rhonda
Weird Cousin / Baby Oskar
Grandpa's Sister / Synchronized Swimming
Helga Sleepwalks / Fighting Families
Headless Cabbie / Friday the 13th
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
Sid the Vampire Slayer / Big Sis
Bag of Money / Principal Simmons
New Bully on the Block / Phoebe Breaks a Leg
Helga's Locket / Sid and Germs
Suspended / Ernie in Love
Stuck in a Tree / Rhonda Goes Broke
Beaned / Old Iron Man
Arnold Visits Arnie / Chocolate Boy
Harold vs. Patty / Rich Guy
April Fools' Day
Gerald's Game / Fishing Trip
On the Lam / Family Man
The Racing Mule / Curly's Girl
Timberly Loves Arnold / Eugene, Eugene!
Ghost Bride / Gerald vs. Jamie O.
A Day in the Life of a Classroom / Big Bob's Crisis