Dennis Christopher
Jack
Elliott Gould
The Giant
Jean Stapleton
The Giantess
Katherine Helmond
Jack's Mother
Mark Blankfield
Strange Little Man / Fairy / Narrator
Jerry Hall
The Lady of the Harp
Lise Lang
Spot, the Cow
Ty Crowley
Spot, the Cow
Lamont Johnson
Spot, the Cow (voice)
Billy Bryan
The Hen Puppeteer
Shelley Duvall
Self - Host (uncredited)