Chris O'Dowd as Narrator (voice)

Amy Huberman as Puffin Egg Mammy (voice)

Eva Whittaker as Isabelle (voice)

Beth McCafferty as Oona (voice)

Aaron MacGregor as Marvin (voice)

Euan McGrath as Phoenix (voice)

James David Henry as Mossy (voice)

Anna McDaid as May (voice)

Geraldine Cole as Mama (voice)

Matt Deery as Papa (voice)

Evan Lordan as Puffin Egg Daddy (voice)

Orna Canning as Flynn (voice)

Clara McLaughlin as Silky (voice)

Jim Craig as Bernie (voice)

Mara Reid Moore as Lala (voice)

Laura McCallan as Spiky (voice)

Lorraine Lordan as Isabelle's Mammy (voice)

Paul Young as Isabelle's Daddy (voice)

Sophie Borlée as Additional Voices (voice)

Eimear Doherrty as Additional Voices (voice)

Caoimhe Ni Bhradaigh as Additional Voices (voice)

Jeremy Purcell as Additional Voices (voice)