Brendan Gleeson

Abbot Cellach (voice)

Evan McGuire

Brendan (voice)

Christen Mooney

Aisling (voice)

Mick Lally

Aidan (voice)

Liam Hourican

Brother Tang / Leonardo (voice)

Paul Tylak

Brother Assoua (voice)

Michael McGrath

Adult Brendan (voice)

Paul Young

Brother Square (voice)

Nora Twomey

Additional Voices and Walla (voice)

Alli McCann

Additional Voices and Walla (voice)

Clair Funchion

Additional Voices and Walla (voice)

Conor O'Halloran

Additional Voices and Walla (voice)

Gaelle Hersent

Additional Voices and Walla (voice)

Marie Thorhauge

Additional Voices and Walla (voice)

Sean Ono Lennon

Additional Voices and Walla (voice)

Jonas Hoffmann

Additional Voices and Walla (voice)

Fabian Erlinghäuser

Additional Voices and Walla (voice)

Kairen Waloch

Additional Voices and Walla (voice)

James William O'Halloran

Additional Voices and Walla (voice)

Fabrice Ziolkowski

Writer

James Flynn

Executive Producer

Ivan Rouvreure

Executive Producer

Tomm Moore

Director