Kathleen Wilhoite (33)

Pepper Ann (voice)

Danny Cooksey (21)

Milo (voice)

Clea Lewis (32)

Nicky (voice)

April Winchell (37)

Mom (voice)

Hadley Kay (24)

Unknown

Alex Trebek (57)

Unknown

Lauren Tom (36)

Unknown

Nicole Sullivan (27)

Tundra Woman (voice)

Evel Knievel (58)

Unknown

Mark Hamill (45)

Unknown

Jodi Benson (35)

Amber O'Malley (voice) /

Isabel Sanford (80)

/ Bernice (voice)

Don Adams (74)

Principal Hickey (voice)

Tara Strong (24)

/ Brenda / Female Scientist (voice)

Paddi Edwards (65)

Vera Groober-Schwartz (voice)

Tino Insana (49)

Uncle Jo Jo (voice)

Jess Harnell (33)

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

Kathy Najimy (40)

Coach Doogan (voice)

Jenna Von Oÿ (20)

Trinket (voice)

Bebe Neuwirth (38)

Ms. Bladdar (voice)

Jason Marsden (22)

Prep School Guy (voice)

Jeff Bennett (34)

/ Craig Bean / Dieter Liederhosen / Vittorio (voice) / Noah / Additional Voices (voice) / Larry / Additional Voices (voice) / J.B. / Additional Voices (voice) / Dieter Liederhosen / Shelf McClain (voice) / Dieter Liederhosen / Emit Swink / Shelf McClain (voice) / Dieter Liederhosen / Pink-Eye Pete (voice) / Dieter Liederhosen (voice) / Dieter Liederhosen / Craig Bean / Shelf McClain (voice) / Craig Bean (voice) / Grandpa Leo / Additional Voices (voice)

Don Lake (40)

Mr. Sherman Finky (voice) / Mr. Sherman Finky / Butler (voice)

Candi Milo (36)

Constance Goldman (voice) / Constance Goldman / Deeana / Biana (voice) / Rose (voice)

Pamela Adlon (31)

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

Wallace Langham (32)

Wayne Macabre (voice; uncredited)

Hedy Burress (23)

Effie Shrugg (voice)

Jim Cummings (44)

Mr. Roland Carter (voice)

Susan Tolsky (54)

Aunt Janie Diggety / Aunt Lanie (voice) / Aunt Janie Diggety (voice)

Shaun Fleming (10)

Cookie (voice)