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Hey Arnold!
Season 3 · Episode 33
Biosquare
8.011mDecember 7, 1998
As a science assignment, Arnold and Helga have to work together, and get along with each other, for 24 hours in the Sunset Arms greenhouse.
Episodes
- Episode 1Helga Blabs It All
- Episode 2Harold the Butcher
- Episode 3Dangerous Lumber
- Episode 4Mr. Hyunh Goes Country
- Episode 5Casa Paradiso
- Episode 6Gerald's Tonsils
- Episode 7Arnold's Room
- Episode 8Helga vs. Big Patty
- Episode 9Stinky Goes Hollywood
- Episode 10Olga Gets Engaged
- Episode 11Curly Snaps
- Episode 12Preteen Scream
- Episode 13Grandpa's Birthday
- Episode 14Road Trip
- Episode 15Sid's Revenge
- Episode 16Roller Coaster
- Episode 17The Aptitude Test
- Episode 18Oskar Gets a Job
- Episode 19Arnold Betrays Iggy
- Episode 20Helga and the Nanny
- Episode 21Career Day
- Episode 22Hey Harold!
- Episode 23Best Man
- Episode 24Cool Party
- Episode 25Arnold & Lila
- Episode 26Grand Prix
- Episode 27Arnold's Thanksgiving
- Episode 28Helga's Show
- Episode 29The Flood
- Episode 30Phoebe Takes the Fall
- Episode 31The Pig War
- Episode 32Part Time Friends
- Episode 33Biosquare
- Episode 34Crabby Author
- Episode 35Rich Kid
- Episode 36Girl Trouble
- Episode 37School Dance
- Episode 38School Play