Decades later, Arnold’s legacy still lives on.

Meet some of the voices behind your favorite animated characters, ahead.

Jamil Walker Smith as Gerald Johanssen

Hey Arnold!found its Gerald Johanssen in Jamil Walker Smith.

The Voices Behind ‘Hey Arnold!'

Credit: Nickelodeon Network/Courtesy Everett Collection

Justin Shenkarow as Harold Berman

Justin Shenkarow joinedHey Arnold!as insecure loudmouth Harold Berman.

’s run, in the role of country boy Stinky Petersen.

The actor, who had a previous gig inLittle Giants, played the Southern-accented character for all five seasons.

Lane Toran, Phillip Van Dyke, and Spencer Klein as Arnold

Nickelodeon; Showtime Networks Inc./Courtesy Everett Collection; Paramount Television/Courtesy Everett Collection; Rysher Television / Courtesy Everett Collection

’s Phoebe Heyerdahl, the class’ resident smarty-pants.

Olivia Hack as Rhonda

Olivia Hack joinedHey Arnold!as the popular Rhonda Wellington Lloyd.

During her run on the animated show, Hack also played Tana Schrick onGilmore Girls.

Francesca Marie Smith as Helga Pataki

Nickelodeon

Jamil Walker Smith as Gerald Johanssen

Nickelodeon; George Pimentel/WireImage

Justin Shenkarow as Harold Berman

Nickelodeon; Vivien Killilea/WireImage

Christopher Walberg as Stinky Petersen

Nickelodeon; Warner Bros/Courtesy Everett Collection

Sam Gifaldi as Sid

Nickelodeon; Warner Bros/Courtesy Everett Collection

Anndi McAfee as Phoebe Heyerdahl

Nickelodeon; Courtesy Everett Collection

Craig Bartlett as Brainy

Nickelodeon; Frederick M. Brown/Getty Images

Olivia Hack as Rhonda

Nickelodeon; Jean-Paul Aussenard/WireImage

Hey Arnold Voices

Nickelodeon; Michael Buckner/Getty Images

Hey Arnold Voices

Nickelodeon; Joshua Blanchard/Getty Images