Yonas Kibreab
Elio / Other Elio (voice)

Remy Edgerly
Glordon (voice)

Zoe Saldaña
Olga Solís (voice)

Brad Garrett
Lord Grigon (voice)

Brandon Moon
Ambassador Helix (voice)

Jameela Jamil
Ambassador Questa (voice)

Young Dylan
Bryce (voice)

Jake T. Getman
Caleb (voice)

Matthias Schweighöfer
Ambassador Tegmen (voice)

Ana de la Reguera
Ambassador Turais (voice)

Atsuko Okatsuka
Ambassador Naos (voice)

Shirley Henderson
Ooooo (voice)

Naomi Watanabe
Ambassador Auva (voice)

Brendan Hunt
Gunther Melmac (voice)

Anissa Borrego
Ambassador Mira (voice)

Shelby Young
Diplo Ship (voice)

Bob Peterson
Universal Users Manual (voice)

Kate Mulgrew
Museum Exhibit Narrator (voice)

Tamara Tunie
Colonel Markwell (voice)