Yonas Kibreab as Elio / Other Elio (voice)

Zoe Saldaña as Olga Solís (voice)

Remy Edgerly as Glordon (voice)

Brandon Moon as Ambassador Helix (voice)

Brad Garrett as Lord Grigon (voice)

Jameela Jamil as Ambassador Questa (voice)

Young Dylan as Bryce (voice)

Jake T. Getman as Caleb (voice)

Matthias Schweighöfer as Ambassador Tegmen (voice)

Ana de la Reguera as Ambassador Turais (voice)

Atsuko Okatsuka as Ambassador Naos (voice)

Shirley Henderson as Ooooo (voice)

Naomi Watanabe as Ambassador Auva (voice)

Brendan Hunt as Gunther Melmac (voice)

Anissa Borrego as Ambassador Mira (voice)

Shelby Young as Diplo Ship / Additional Voices (voice)

Bob Peterson as Universal Users Manual / Additional Voices (voice)

Kate Mulgrew as Museum Exhibit Narrator (voice)

Tamara Tunie as Colonel Markwell (voice)

Evan Agos as Additional Voices (voice)

Izz Quedy B Akhirudin as Additional Voices (voice)

Jesse Berry as Additional Voices (voice)

Trinity Bliss as Additional Voices (voice)

David W. Collins as Additional Voices (voice)

Terri Douglas as Additional Voices (voice)

Chris Edgerly as Additional Voices (voice)

Oscar Eisenbise as Additional Voices (voice)

Adam Faison as Additional Voices (voice)

Lexi Fontaine as Additional Voices (voice)

Kendra Fountain as Additional Voices (voice)

Kellen Goff as Additional Voices (voice)

Leah Mei Gold as Additional Voices (voice)

Krysta Gonzales as Additional Voices (voice)

Jake Green as Additional Voices (voice)

Noel Hayase as Additional Voices (voice)

Jason Kaye as Additional Voices (voice)

Kevin Keys as Additional Voices (voice)

Andrew Kishino as Additional Voices (voice)

Uplaksh Kochhar as Additional Voices (voice)

Jennie Kwan as Additional Voices (voice)

Brian Larsen as Additional Voices (voice)

Scott Menville as Additional Voices (voice)

Andrew Morgado as Additional Voices (voice)

Abdoulaye N'Gom as Additional Voices (voice)

Trong Phuc as Additional Voices (voice)

Claudia Razzi as Additional Voices (voice)

Alejandra Reynoso as Additional Voices (voice)

Andrew Rivas as Additional Voices (voice)

Zeno Robinson as Additional Voices (voice)

Angela Sarafyan as Additional Voices (voice)

Michael Schwalbe as Additional Voices (voice)

Madeline Sharafian as Additional Voices (voice)

Domee Shi as Additional Voices (voice)

Janellen Steininger as Additional Voices (voice)

Tara Strong as Additional Voices (voice)

Richard Tatum as Additional Voices (voice)

Elias Toufexis as Additional Voices (voice)

Arianna Villavicencio as Additional Voices (voice)

Kari Wahlgren as Additional Voices (voice)

Evan Whitten as Additional Voices (voice)

Michelle Wong as Additional Voices (voice)

Matthew Wood as Additional Voices (voice)

Joe Zieja as Additional Voices (voice)