Rinty becomes the best pal of juvenile "human" hero Danny O'Shea. Their devotion to one another is proven beyond doubt when Danny is threatened by kidnappers.
| Actor | Role |
|---|---|
 Rin-Tin-TinRinty | Rinty |
 Virginia Brown FaireVirginia Calhoun | Virginia Calhoun |
 Carroll NyeRobert Hammond | Robert Hammond |
 Robert GordonDanny O'Shea | Danny O'Shea |
 James Pier MasonBruce Morgan | Bruce Morgan |
 Pat HartiganTramp | Tramp |