Kathleen Wilhoite
Pepper Ann (voice)

Danny Cooksey
Milo (voice)

Clea Lewis
Nicky (voice)

April Winchell
Mom (voice)

Luke Perry
Stewart Walldinger (voice)

Don Adams
Principal Hickey / Principal Hickey (voice)

Kimmy Robertson
Gwen Mezzrow

Jeff Bennett
/ Craig Bean (voice) / Larry / Additional Voices (voice) / Dieter Liederhosen (...

Candi Milo
Constance Goldman (voice) / Constance Goldman / Deeana / Biana (voice) / Rose (v...

Alex Trebek

Pamela Adlon
Moose Pearson (voice) / Moose Pearson / Goose O'Shaunassy (voice)

Mark Hamill

Tara Strong
/ Brenda / Female Scientist (voice)

Paddi Edwards
Vera Groober-Schwartz (voice)

Jess Harnell
/ Abe (voice) / Male Scientist / Nigel / Mailman (voice)

Jenna von Oy
Trinket (voice)

Kath Soucie
Mail Lady (voice) / Mean Girl (voice) / Cissy Rooney / Supermodel Mindy (voice)

Hadley Kay

Jodi Benson
/ Amber O'Malley (voice)

Isabel Sanford
/ Bernice (voice)