Yonas Kibreab

Character: Elio / Other Elio (voice)

Remy Edgerly

Character: Glordon (voice)

Zoe Saldaña

Character: Olga Solís (voice)

Brad Garrett

Character: Lord Grigon (voice)

Brandon Moon

Character: Ambassador Helix (voice)

Jameela Jamil

Character: Ambassador Questa (voice)

Young Dylan

Character: Bryce (voice)

Jake T. Getman

Character: Caleb (voice)

Matthias Schweighöfer

Character: Ambassador Tegmen (voice)

Ana de la Reguera

Character: Ambassador Turais (voice)

Atsuko Okatsuka

Character: Ambassador Naos (voice)

Shirley Henderson

Character: Ooooo (voice)

Naomi Watanabe

Character: Ambassador Auva (voice)

Brendan Hunt

Character: Gunther Melmac (voice)

Anissa Borrego

Character: Ambassador Mira (voice)

Shelby Young

Character: Diplo Ship (voice)

Bob Peterson

Character: Universal Users Manual (voice)

Kate Mulgrew

Character: Museum Exhibit Narrator (voice)

Tamara Tunie

Character: Colonel Markwell (voice)