Ruby Marinho - Monstro Adolescente - 7.29★

Lana Condor - Ruby Gillman (voice)

Toni Collette - Agatha Gillman (voice)

Annie Murphy - Chelsea Van Der Zee (voice)

Sam Richardson - Uncle Brill (voice)

Liza Koshy - Margo (voice)

Will Forte - Gordon Lighthouse (voice)

Colman Domingo - Arthur Gillman (voice)

Jaboukie Young-White - Connor (voice)

Blue Chapman - Sam Gillman (voice)

Ramona Young - Bliss (voice)

Eduardo Franco - Trevin (voice)

Jane Fonda - Grandmamah (voice)

Nicole Byer - Janice (voice)

Echo Kellum - Doug (voice)

Brianna Arsement - Home Buyer (voice)