Hey Arnold!
Helga's sister Olga comes home for spring break and becomes a classroom aid in Helga's class, much to Helga's chagrin.
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Spencer Klein
Arnold (voice)
Francesca Marie Smith
Helga Pataki (voice)
Jamil Walker Smith
Gerald Johanssen (voice)
Justin Shenkarow
Harold Berman (voice)
Dan Castellaneta
Grandpa Phil (voice)
Christopher Walberg
Stinky Peterson (voice)
Maurice LaMarche
Big Bob Pataki (voice)
Kath Soucie
Miriam Pataki (voice)
Nika Futterman
Olga Pataki (voice)
Dan Butler
Mr. Simmons (voice)
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