A delightful retelling of the classic fairytale by Hanna-Barbera, using live action and animation.
| Actor | Role |
|---|---|
 Bobby RihaJack | Jack |
 Dick BealsJack (singing voice) | Jack (singing voice) |
 Gene KellyJeremy Keen, the Peddler | Jeremy Keen, the Peddler |
 Ted CassidyThe Giant (voice) | The Giant (voice) |
 Janet WaldoPrincess Serena (voice) | Princess Serena (voice) |
 Marni NixonPrincess Serena (singing voice) | Princess Serena (singing voice) |
 Marian McKnightJack's Mother | Jack's Mother |
| CChris AllenMouse (voice) | Mouse (voice) |
 Leo De LyonWoggle-Bird (voice) | Woggle-Bird (voice) |
| CCliff NortonWoggle-Bird (voice) | Woggle-Bird (voice) |
| DDon MessickCat / Mice (voice) (uncredited) | Cat / Mice (voice) (uncredited) |