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Arnold (voice), Caller (voice), Harry Arm (voice)
54 episodes
Ms. Frizzle (voice)
52 episodes
Carlos (voice)
Ralphie (voice)
Keesha (voice)
Wanda (voice)
Dorothy Ann (voice)
Phoebe (voice)
The Producer (voice)
Tim (voice)
Female Producer (voice), NASA Woman (voice), Caller (voice), Baby (voice), Additional Voices (voice)
9 episodes
Mr. Ruhle (voice)
4 episodes
Janet Perlstein (voice), Caller (voice)
Caller (voice), Kid (voice)
3 episodes
Dr. Tennelli (voice), Ralphie's Mom (voice)
2 episodes
Mrs. Li (voice)
Plutonian Caller (voice), Ghostly Call-Taker (voice)
Caller (voice)
Mikey Ramon (voice), Caller (voice)
Dorothy Ann's Mom (voice)
Caller (voice), Tiffany (voice)
Cornelia C. Contralto II (voice)
1 episode
Mr. Perlstein (voice)
Mr. Terese (voice)
Baker (voice)
Mr. Junkett (voice)
Gen. Aranius (voice)
Announcer (voice)
Harry Herpst (voice)
Mrs. Franklin (voice)
Mr. Ramon (voice)
Archibald Seedplot (voice)
Logaway Larry (voice)
Inspector 47 (voice)
Ashlee Walker Club Dupree (voice)
Katrina Eloise 'Murph' Murphy (voice)
Molly Cule (voice)
Horace Scope (voice)
Flora Whiff (voice)
Mr. McClean (voice)
Garth Sinew (voice)
Gerri Poveri (voice)
Dr. Carmina Skeledon (voice)
Radius Ulna 'R.U.' Humerus (voice)
Father (voice)
Photographer (voice)
Boy / Man / Mascot (voice)
Tow Truck Driver (voice)
Judge (voice)
Switch Operator (voice)
Evan Rourke (voice)
Customer (voice)
