Colin O'Donoghue

as Shane

as Gerry (voice)

as Douxie (voice)

as Dr. Callahan (voice) (2 episodes)

as Gordon Cooper (8 episodes)

as Douxie (voice) (10 episodes)

as JJ Sneed (1 episode)

as Abe (voice)

as Self

as Peter

as Professor Harrison

as Brennan

as Mark

as Captain Hook (134 episodes)

as Michael Kovak

as Young Guard

as Ben

as Duke Philip of Bavaria (1 episode)

as Nick

as Brendan

as Conor Elliott (13 episodes)