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)

Lamont Johnson