Colin O'Donoghue

as Gerry (voice)

as Douxie (voice)

as Dr. Callahan (voice)

as Gordon Cooper

as Douxie (voice)

as JJ Sneed

as Abe (voice)

as Peter

as Professor Harrison

as Brennan

as Mark

as Captain Hook

as Michael Kovak

as Young Guard

as Ben

as Duke Philip of Bavaria

as Conor Elliott

as Shane