Brianna Gentilella
Molly (voice) / Molly (singing voice)

Frank Welker
Bubble Puppy (voice)

Tino Insana
Mr. Grouper (voice)

Quinn Breslin
Gil (voice)

AJ Kane
Nonny (voice)

Leah Janvier
Zooli (voice)

Fred Tatasciore
Mr. Grouper (voice)

Bailey Gambertoglio
Molly (voice)

Grace Kaufman
Deema (voice)

Tori Feinstein
Oona (voice)

Jet Jurgensmeyer
Nonny (voice)

Zachary Gordon
Gil (voice)

Angelina Wahler
Deema (voice)

Reyna Shaskan
Oona (voice)

Eamon Pirruccello
Nonny (voice)

Josiah Gaffney
Goby (voice)

Zoe Glick
Deema (voice)

Mia Lynn Bangunan
Oona (voice)

Jacob Bertrand
Gil (voice)

Marleik 'Mar Mar' Walker
Goby (voice)