Note: The episodes are organized based on information from the Hey Arnold! Wiki.
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1A Downtown as Fruits
1B Eugene's Bike
Arnold and Eugene enjoying a day out, and all of the bad things happening to Eugene (he fails to catch a home-run ball at a baseball game, chokes on a hot dog and subsequently gets hit in the eye with the piece that flew out of his mouth, and he falls into the river while looking out over the docks).
2A The Little Pink Book
2B Field Trip
Arnold and his grandma break into the aquarium to free an old aged mistreated turtle. They pass by a security guard who is too preoccupied with tormenting the animals to even notice them. Though what he does is actually pretty funny:
Guard:(laughing) Here, have a cookie. (penguin coughs up cookies and squawks angrily) Uh oh, you tossed your cookies. Here have a cookie. (penguin coughs up cookie and squawks angrily) Uh oh, you tossed your cookies again.
Later on, when Arnold and his grandma are escaping with said turtle, they pass by the guard who is now taunting a shark.
Guard:(dipping his hand in and out of the shark tank) Let's go big shark. Come on, Jaws. Bite me. (he falls into the tank and is cornered by shark) WHAAA!
Stoop Kid: (As Harold turns around the corner) HEY! (jumps off stoop, Harold's jaw drops) COME HERE FAT BOY! I'M GONNA ROLL YOU DOWNTOWN!
Harold:(starts running away) Ahhhh! Help! Mommy!
4A Helga's Makeover
Helga gives herself a makeover, in order to look more girly for Rhonda's party. When her mother Miriam opens the bathroom door and sees the finished product she gasps and faints, causing Helga to say "Maybe I should've gone a bit lighter on the eye shadow."
4B The Old Building
5A 6th Grade Girls
5B The Baseball
Arnold walks into the kitchen where his grandma is sitting at the table.
Grandma: I can't stand it Arnold! It's hotter than blazes! I'm a grandma with a husband, a young grandson, and a boarding house full of people to be responsible for.
Arnold:(to himself) This heat's so crazy it's got Grandma acting normal.
The entire scene with the Jolly Olly man.
Helga:(climbs atop ice cream truck) We've had enough! We want our ice cream, and we want it at a price we kids can afford!
Harold: You said it, sister!
Iggy: That's right!
Helga: And if we don't get it, we're going to do something really bad!
(Crowd yells in agreement and rocks the ice cream truck.)
Jolly Olly Man: Okay, okay! (thinks) You can have "Rum Raisin" for 10 [dollars].
And then the kids try to do so with Helga still on the truck!
Eugene, trying to help (in his typical clueless way) by attempting to lift up the entire back end of the ice cream truck. He predictably hurts himself, and spends the rest of the scene marching back and forth and clutching his back while the other kids rock and shake the truck.
Helga forges Olga's report card (making her think she got a B+ and sending the poor girl into a depression) and begins getting all the gifts that Olga turned down (as she thinks she's a failure just because she got a B+), Helga eats from a box of chocolates and gloats how she finally took over being the favorite of the family — until she chokes on the chocolate and has to give herself the Heimlich maneuver.
Near the end, Helga begins to realize just how badly Olga is affected by her prank and feels pity for her, alone and crying in her room. She remarks that there's only "one thing to do" ...and promptly closes Olga's door to lessen the noise.
15B Sally's Comet
16A Abner Come Home
16B The Sewer King (episode)
17A False Alarm
17B World Records
Arnold, his friends, and other people from the neighborhood try to get into the Book of World Records by making the world's biggest pizza puff.
Gerald: I hope we put in enough baking soda.
Phoebe: 150 teaspoons should be plenty.
Sid:(nervously) "Teaspoons"? I didn't know it was... "teaspoons."
The bulldozer which was going to knock down Mighty Pete is taken over by Arnolds Grandma, Gertie.
Nick Vermicelli:(shouting and chasing Arnold's Grandma) Hey! Crazy lady! Come back here with my bulldozer!
29B New Teacher
During the scene where all the kids "prank" Mr. Simmons by coughing at the same time, the camera pans out to show the entire circle of students, still coughing... with Curly lying dramatically on the floor.
This gem after Curly intentionally drops a pencil in attempt to prank a second new teacher:
Lieutenant Major Goose: Who deployed that pencil? It was a calculated act! (Walks to Curly's desk) Since the foreign object is under your desk, I assume you are the enemy! What is your name?
Goose: Your hair's not curly, boy! What's your real name?
Goose:(Beat) ...Curly! Go stand in that corner facing inward! (Helga laughs) You've earned yourself a corner, little lady! (Harold laughs) And so have you, pally! Move, move, move! (Points at Stinky) You! The remaining corner now!
Mr. Simmons reads Helga's love poem for Arnold for a poetry contest in class and it is signed Anonymous. When Helga hears Mr. Simmons begin to read it, she freaks out and slouches down in her chair prompting the following line from Stinky:
Stinky: Gosh, Helga, you're sliding down your chair like it was your poem or something.
36A Helgas Love Potion
Helga just says "Oh, hi Brainy." and walks away, causing Brainy to suffer a panic attack and then punch himself out.
36B Geralds Secret
37A Steely Phil
37B Quantity Time
38A Eating Contest
38B Rhondas Glasses
39A Eugene Goes Bad
39B What's Opera, Arnold?
40 Arnold's Halloween
Stinky inadvertently reveals to Helga that Arnold and Gerald's radio prank lead to her and her friends getting chased.
(cut to Arnold and Gerald all the way across town)
Arnold: Did you hear something just now?
41A The Aptitude Test
41B Oskar Gets a Job
42A Curly Snaps
42B Pre-Teen Scream
43A Stinky Goes Hollywood
43B Olga Gets Engaged
Helga saves her sister from marrying a con-artist. And she is absolutely appalled that she's doing it.
Helga: I was so close to getting rid of her! So close!!
Helga does some pretty spot on impressions of her classmates, which offends them. Phoebe suggests she do something more positive, so she writes her a REALLY CORNY poem complimenting her classmates in PAINFUL, PAINFUL rhyme. Plus, the music that plays while she's reading it.
Helga: Curly, now there's an original kid. (weird rimshot noise)
58B The Flood
Helga is trying to escape, but then she runs into Principal Wartz who was just dancing in the halls with a sombrero, poncho, and maracas.
Wartz: Are you attempting to leave school grounds without permission, Miss Pataki?
Helga:(Deadpanned) Are you attempting to dance The Flamingo, Principal Wartz?
Wartz: This moment never happened.
(both walk past each other)
59 School Play
All of Mr. Hyunh's scenes.
Mr. Hyunh: I will help you Arnold!
Arnold: You, Mr. Hyunh?
Mr. Hyunh: YES! I am very dramatic! (strikes a pose)
Grandpa: That's a polite word for what you are. (rimshot)
Stinky's father, seeing his hard work to grow something in their garden, hands his grandfather's "magic" spud over to him.
Stinky: Thank you! But why didn't you give it to me while you saw me digging the garden with a ladle?
Father: Because that's what held the kitchen table.
62A Dinner for Four
Arnold wants Helga to go back to Chez Paris and come clean about the dinner fiasco.
Helga: Look, I am not going to go in there and tell them the truth and wind up washing dishes. (Gilligan Cut) I can't believe I told them the truth and I wound up washing dishes!
62B Phoebe Skips
63A Full Moon
Principal Wartz is trying to get Arnold to state who mooned him (Wartz), but Arnold won't because he's not a snitch. Wartz tells a story of how in school he tattled on some classmates and could Never Live It Down, essentially destroying his social life. He states that he didn't care what anyone else thought of him, because he knew he had done the right thing. And in the end, he became an elementary school principal.
Wartz: ...Wouldn't you like to be an elementary school principal?
Arnold:(Unimpressed) Not really.
(Wartz's eyes pop open with a comical 'boing!')
63B Student Teacher
64A Big Gino (episode)
64B Jamie O in Love
65A The Beeper Queen
Arnold sees Helga with a melted ice cream cone in her hand and asks her what's wrong. She starts a passionate speech about her mom, gesticulating fiercely with the ice cream still in her hand. After she finishes, the camera cuts to Arnold, who is splattered all over with chocolate ice cream.
65B Oskar Can't Read?
66A Headless Cabbie (episode)
66B Friday the 13th
67A Helga's Parrot (episode)
A parrot mimics a love poem for Arnold that Helga recites in her sleep and she spends the episode trying to stop Arnold from hearing it. She tracks him down to the pet store but covers to say she's buying a monitor lizard. Unfortunately for her, the woman behind the counter is relieved to get rid of it and plops the giant reptile into Helga's arms. Then theres a Gilligan Cut to Helga leaving the lizard with Phoebe for the night. And the next day when she limps into school, Phoebe is holding the lizard on a leash in the middle of the class.
Helga is also forced by circumstance to spend the night hidden in Arnold's room. When he starts to get undressed for bed, Helga tries to cover her eyes. But she can't resist a peak and falls backwards smiling.
YMMV, but Helga's tirade to Harold is downright HILARIOUS.
76A Grandpa's Sister
76B Synchronized Swimming
77A Helga's Masquerade
77B Mr. Green Runs
78 Helga on the Couch
After another unexpected encounter with Arnold, Helga walks into an alley where Brainy (once again) is waiting for her. She proceeds to call him out on it.
Helga: Look, Brainy, this is just weird. How is it that you're standing behind me again? How did you get in this little arch? Were you waiting for me to come to this alley? What's your deal?
79 Dino Checks Out
80 Summer Love
81A Sid the Vampire Slayer
81B Big Sis
82A Gerald's Game
82B Fishing Trip
The smell of multiple farts coming from both tents rises up to the trees above, where an owl perched on a tree branch dies from the smell and falls out of the tree. Grandpa Phil notices the dead bird lying on the ground the next morning.
Grandpa: Aww, look. A dead owl. BREAKFAST!
Sid gets a fish from the river caught on his nose. His dad manages to remove the fish and throws it back into the water. Since the group of men and boys havent had any success in catching fish, Sids dad gets glared at by the other dads.
Sids Dad: Did I just throw that fish in the river?
83A Bag of Money
83B Principal Simmons
84A New Bully on the Block
84B Phoebe Breaks a Leg
85A Stuck in a Tree
There are two funny lines from Harold: "Arnold and Eugene stuck in a tree! S-T-U-K in a tree! Hahaha! You're so stupid!" and "Two nickels? That's fifteen cents!"
85B Rhonda Goes Broke
86A Helga's Locket
86B Sid and Germs
87B Old Iron Man
88A Ghost Bride (episode)
88B Gerald vs. Jamie O
Harold's repeated attempts to break into P.S. 118.
Arnold getting embarrassed by the other kids when he shows up to the practice field in bear pajamas.
The following from the same episode:
Arnold: I'm supposed to visit my cousin Arnie.
Lila: Arnie? You mean, your oh so interesting and likable country cousin that looks almost exactly like you only much more attractive?
(Helga and Arnold stare at her.)
Helga: That's one twisted version of the story.
Harold's reason on why Arnie's weird: "He's always counting food instead of eating it!"
Later, at a convenience store:
Gerard: Eleven cents?! Boy howdy that's completely outrageous! It's unacceptable!
Kid: Quit overreacting Gerard and cool out.
Arnold's reaction to Lulu flirtatiously winking at him: "Oh please."
Arnold tries to stop Lulu from liking him.
Arnold: But you're ARNIE'S girlfriend and, WE'RE NINE!"
90B Chocolate Boy (episode)
91A Harold vs. Patty
When Patty is teaching Harold concentration for becoming a better arm wrestler, the challenge is to walk across a log over a river.
Harold: I don't like this, Patty. It's sc-scaring me.
Patty: Just look straight ahead and you'll be fine. And remember: balance.
(Harold struggles to maintain balance on the log, lands on his butt, and falls into the river)
After Harold loses to Patty in the Hillwood City Arm Wrestling Tournament, Sid and Stinky once again proceed to make fun of Harold losing to her. Harold decides he's had enough of their rudeness and starts shouting at them. (Doubles as an Awesome Moment.)
Harold:(yelling) SO WHAT IF I LOST TO A GIRL?! Patty's the best arm wrestler-
(he grabs Sid and Stinky by their shirts)
Harold: -in the whole city and she's my friend! I'm proud to lose to her, and if anyone has a problem with that, I'll pound them!
(Harold smacks Sid's and Stinky's heads together and they fall to the floor)
Sid and Stinky: Ow...
91B Rich Guy
Mr. Redman's robot butler Mr. Egg Cream mistaking Grandpa Phil for Redman and offering him an egg cream.
Mr. Egg Cream: Your egg cream, Mr. Redman.
Grandpa: I dont want an egg cream. How about a sack of money?
92A The Racing Mule
92B Curly's Girl
93A On the Lam
93B Family Man
94A Grandpa's Packard
94B Phoebe's Little Problem
95A A Day in the Life of a Classroom
95B Big Bob's Crisis
97A Timberly Loves Arnold
97B Eugene, Eugene!
98 April Fool's Day
99 & 100 The Journal
Hey Arnold!: The Movie
After Helga's confession and an awkward kiss, Arnold states he's dizzy, and needs to go lie down. Helga's response: "Wonderful...I'll go with you!"