Matthew Modine

Jack Robinson

Vanessa Redgrave

Countess Wilhelmina

Mia Sara

Ondine

Daryl Hannah

Thespee

Jon Voight

Siggy

Richard Attenborough

Magog

Bill Barretta

Thunderdell

Honor Blackman

Jules

Jim Carter

Odin - Member of the Great Council of Mac Slec

James Corden

Bran - Thunderdell's Son

JJ Feild

Young Jack

Jonathan Hyde

Dussan

Anton Lesser

Vidas Merlinis

Julia McKenzie

Jack's Mum

Clare Angelini Heather

Wedding Guest (uncredited)

Nicholas Beveney

Cernos

Roger Blake

Giant Thor

Mel Cobb

Journalist