Hé Arnold !

Olivia Hack

Rhonda Wellington Lloyd (voice) · Rhonda Wellington Lloyd / Mary (voice)

Dan Castellaneta

Grandpa Phil / Nolo (voice) · Big Arnold (voice) · Grandpa Phil / Judge (voice) · Animal Control Officer (voice) · Grandpa Phil / Nick Vermicelli (voice) · Grandpa Phil / Reporter (voice) · Grandpa Phil / Cop #1 (voice) · Delivery Man (voice) · Nick Vermicelli (voice) · Grandpa Phil (voice) · Grandpa Phil / Grandpa Phil's Father / Jolly Olly Man (voice) · Grandpa Phil / Chicken Man (voice)

Justin Shenkarow

Harold Berman / Iggy (voice) · Harold Berman(voice) · Harold Berman (voice; uncredited) · Joey (voice) · Harold Berman / Boy on Bicycle (voice) · Harold Berman (voice) · Harold Berman / Robert (voice)

Phillip Van Dyke

Ludwig (voice) · Arnold (voice)

Anndi McAfee

Phoebe Heyerdahl / Worker #2 (voice) · Patrice (voice) · Phoebe Heyerdahl / Ruth P. McDougal (voice) · Phoebe Heyerdahl / Italian Girl / French Girl (voice) · Phoebe Heyerdahl / Joy (voice) · Phoebe Heyerdahl / Clerk (voice) · Phoebe Heyerdahl (voice) · Phoebe Heyerdahl / Girl (voice) · Phoebe Heyerdahl / Woman (voice) · Phoebe Heyerdahl / Kid #2

Lane Toran

Wolfgang / French Boy (voice) · Arnold (voice) · Arnold (singing voice) · Wolfgang (voice)

Christopher Walberg

Stinky (voice) · Stinky Peterson / Kyle (voice) · Stinky Peterson (voice; uncredited) · Stinky Peterson / Bratty Kid #1 (voice) · Stinky Peterson (voice)

Michael Welch