Season 4

E1. Full Moon

Mar 10, 1999 · 11m

Harold, Sid, and Stinky all moon Principal Wartz, but Arnold is blamed, even though he was just an innocent bystander.

E2. Student Teacher

Mar 10, 1999 · 11m

Helga's sister Olga comes home for spring break and becomes a classroom aid in Helga's class, much to Helga's chagrin.

E3. Big Gino

Mar 15, 1999 · 11m

After Sid works off a debt with loan shark Big Gino, the two become friends, but when Sid is told to give Arnold a swirlie, he has to choose between the two.

E4. Jamie O in Love

Mar 15, 1999 · 11m

Gerald's older brother Jamie O has a sudden burst of kindness when he finds a girlfriend, but Arnold and Gerald soon find out that the girl is just using Jamie O.

E5. Eugene's Birthday

Mar 17, 1999 · 11m

After losing Eugene's birthday party invitations, Arnold feels obliged to throw him another party, but it doesn't work out.

E6. Stinky's Pumpkin

Mar 17, 1999 · 11m

Stinky grows a huge pumpkin to enter in a city competition.

E7. The Beeper Queen

Mar 29, 1999 · 11m

After Bob pops his spine, Miriam runs Big Bob's Beepers. She gets in over her head and forgets about her family.

E8. Oskar Can't Read?

Mar 29, 1999 · 11m

Arnold finds out that Oskar is illiterate and tries to teach him to read.

E9. Dinner for Four

Mar 31, 1999 · 11m

Helga wants to show Arnold that she can be as sophisticated as Lila is by taking him, Gerald, and Phoebe out to dinner with a coupon she won. She devises a plan to get out of paying when she discovers they're at the wrong restaurant.

E10. Phoebe Skips

Mar 31, 1999 · 11m

Phoebe is promoted to the sixth grade, but realizes that her new so-called "friends" are just using her to do their homework.

E11. Helga's Parrot

Apr 5, 1999 · 11m

A sleep-talking Helga confides into Bob's parrot about her love for Arnold. The next day, the parrot flies into Arnold's window, and it is up to Helga to get it.

E12. Chocolate Turtles

Apr 5, 1999 · 11m

Crisis strikes when Gerald's little sister, Timberly, eats a stock of chocolate turtles that he and Arnold are supposed to sell for a local scout organization.

E13. Love and Cheese

Apr 7, 1999 · 11m

Helga tries to separate Arnold from Lila while at the annual Cheese Fair.

E14. Weighing Harold

Apr 7, 1999 · 11m

Harold, after discovering his friends think he is obese, decides to go on a weight-loss cruise. When he comes back, though, he is noticeably larger.

E15. Back to School

Sep 11, 1999 · 11m

After Grandpa tells Arnold that he never got his grade school diploma, Arnold convinces him to come to go back to school at P.S. 118.

E16. Egg Story

Sep 11, 1999 · 11m

Arnold and Helga must care for an egg for a school project about parenting. Meanwhile, Rhonda and Harold are project partners and must also take care of an egg.

E17. It Girl

Sep 18, 1999 · 11m

Helga becomes a model, but she quits after she gets irritated at everyone dressing like her.

E18. Deconstructing Arnold

Sep 18, 1999 · 11m

Arnold's classmates are tired of constantly telling them the right thing to do, so he stops giving them advice. Nevertheless, when his classmates get into sticky situations, they are in desperate need of his advice.

E19. Grudge Match

Sep 25, 1999 · 11m

After getting in a car accident, Bob and Grandpa face off on the golf green, with the loser having to pay for the damage to both cars.

E20. Polishing Rhonda

Sep 25, 1999 · 11m

Rhonda attends a finishing school, but is far from impressive with her stroppy attitude, and seeks help from fellow student Big Patty.

E21. Weird Cousin

Oct 9, 1999 · 11m

Arnold's bland country cousin, Arnie, comes to visit. Arnold begins to notice that Arnie and Lila show interest in each other, making him jealous.

E22. Baby Oskar

Oct 9, 1999 · 11m

Oskar has to take care of his infant cousin-in-law (also named Oskar), while both Susie and her cousin are gone.

E23. Grandpa's Sister

Oct 16, 1999 · 11m

Phil's twin sister comes for a visit, bringing along an unsettled conflict between them.

E24. Synchronized Swimming

Oct 16, 1999 · 11m

Arnold and the gang are part of a synchronized swimming team led by Coach Wittenburg.

E25. Helga Sleepwalks

Oct 23, 1999 · 11m

After eating pork rinds, Helga sleepwalks, uttering her secret about Arnold as she does so.

E26. Fighting Families

Oct 23, 1999 · 11m

Arnold, Grandpa, Grandma, Ernie, and Mr. Hyunh compete on a game show against a "perfect" family from PS 119

E27. Headless Cabbie

Oct 30, 1999 · 11m

Arnold tells an urban legend about a decapitated taxi driver. The gang goes out, only to find the details in the story are becoming real.

E28. Friday the 13th

Oct 30, 1999 · 11m

Arnold and Gerald try to prove superstitions are fictitious, only for it all to backfire on them.

E29. Veterans Day

Nov 6, 1999 · 23m

Arnold's Grandpa recalls his adventures as a soldier in the Second World War, outwitting a regiment of Nazis, while Gerald's dad, Martin, remembers his own time serving in Vietnam.

E30. Helga on the Couch

Dec 4, 1999 · 23m

Helga confides in the school psychiatrist about her social life, family life, and her love for Arnold.