Hey Arnold!
The daily life of Arnold--a fourth-grader with a wild imagination, street smarts and a head shaped like a football.
Season 3 · Episode 33 ·
Biosquare
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.
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Episode 33 of season 3 of Hey Arnold!: “Biosquare”. Aired 1998-12-07. Watch it online free on ZapFlix.