Drew Massey

Sid / Stack (voice)

Misty Rosas

Sid

Alice Dinnean

Gabriela (voice) / Susie / Zeke / Mom (voice) / Miao Hu (voice) / QT9 (voice)

John Munro Cameron

Gabriela / Dr. Bonabodon / Dad

Allan Trautman

Yangyang (voice) / Gerald / Dad

Alon Williams

Yangyang / Gerald / Zeke

Matthew Yang King

Yangyang

Julianne Buescher

NiuNiu / Grandma / May (voice)

Dana Woods

NiuNiu / Grandma / Miao Hu / May

Christopher Lloyd

Dr. Bonabodon (voice)