Hey Arnold!: 4x23
Grandpa's Sister
Phil’s twin sister comes for a visit, bringing along an unsettled conflict between them.
4 - 1Full Moon Mar. 10, 1999- 4 - 2Student Teacher Mar. 10, 1999
- 4 - 3Big Gino Mar. 15, 1999
- 4 - 4Jamie O in Love Mar. 15, 1999
- 4 - 5Eugene's Birthday Mar. 17, 1999
- 4 - 6Stinky's Pumpkin Mar. 17, 1999
- 4 - 7The Beeper Queen Mar. 29, 1999
- 4 - 8Oskar Can't Read? Mar. 29, 1999
- 4 - 9Dinner for Four Mar. 31, 1999
- 4 - 10Phoebe Skips Mar. 31, 1999
- 4 - 11Helga's Parrot Apr. 05, 1999
- 4 - 12Chocolate Turtles Apr. 05, 1999
- 4 - 13Love and Cheese Apr. 07, 1999
- 4 - 14Weighing Harold Apr. 07, 1999
- 4 - 15Back to School Sep. 11, 1999
- 4 - 16Egg Story Sep. 11, 1999
- 4 - 18Deconstructing Arnold Sep. 18, 1999
- 4 - 19Grudge Match Sep. 25, 1999
- 4 - 20Polishing Rhonda Sep. 25, 1999
- 4 - 21Weird Cousin Oct. 09, 1999
- 4 - 22Baby Oskar Oct. 09, 1999
- 4 - 23Grandpa's Sister Oct. 16, 1999
- 4 - 24Synchronized Swimming Oct. 16, 1999
- 4 - 25Helga Sleepwalks Oct. 23, 1999
- 4 - 26Fighting Families Oct. 23, 1999
- 4 - 27Headless Cabbie Oct. 30, 1999
- 4 - 28Friday the 13th Oct. 30, 1999
- 4 - 29Veterans Day Nov. 06, 1999
- 4 - 30Helga on the Couch Dec. 04, 1999
- 4 - 31Dino Checks Out Dec. 11, 1999