Ruby Gillman, Teenage Kraken

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)

Juju Green

Gym Teacher / Coach (voice)

Preston Arsement

Tourist (voice)

Jordan Matter

School Principal (voice)

Ricardo Hurtado

Student #1 / Student #10 (voice)

Randy Thom

Confetti Cannon (voice)

Tiffany Wu

Student #7 (voice)

Merk Nguyen

Student #6 / Student #9 (voice)

Sydney Bell

Student #5 / Student #8 (voice)

Atticus Shaindlin

Topher (voice)

Lynnanne Zager

Phone Voice (voice)

Karen Foster

School Librarian (voice)

Caleb Pierce

Student #3 (voice)

Qalil Ismail

Student #2 (voice)

Suzanne Buirgy

Carol (voice)

Emma Chamberlain

Reporter (voice)