Season
Season 5 Episode
- Season 3 Helga Blabs It All
- Season 3 Harold the Butcher
- Season 3 Dangerous Lumber
- Season 3 Mr. Hyunh Goes Country
- Season 3 Casa Paradiso
- Season 3 Gerald's Tonsils
- Season 3 Arnold's Room
- Season 3 Helga vs. Big Patty
- Season 3 Stinky Goes Hollywood
- Season 3 Olga Gets Engaged
- Season 3 Curly Snaps
- Season 3 Preteen Scream
- Season 3 Grandpa's Birthday
- Season 3 Road Trip
- Season 3 Sid's Revenge
- Season 3 Roller Coaster
- Season 3 The Aptitude Test
- Season 3 Oskar Gets a Job
- Season 3 Arnold Betrays Iggy
- Season 3 Helga and the Nanny
- Season 3 Career Day
- Season 3 Hey Harold!
- Season 3 Best Man
- Season 3 Cool Party
- Season 3 Arnold & Lila
- Season 3 Grand Prix
- Season 3 Arnold's Thanksgiving
- Season 3 Helga's Show
- Season 3 The Flood
- Season 3 Phoebe Takes the Fall
- Season 3 The Pig War
- Season 3 Part Time Friends
- Season 3 Biosquare
- Season 3 Crabby Author
- Season 3 Rich Kid
- Season 3 Girl Trouble
- Season 3 School Dance
- Season 3 School Play
Hey Arnold! - Season 3 Episode 33 Biosquare
8.02 12 minutes 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.
