 |
Daws Butler as Loopy De Loop (voice) |
 |
Hal Smith as Elderly Woman / Mr. Hyde (voice) |
 |
Don Messick as Car Owner / Dr. Jekyll (voice) |
| Directing | William Hanna | Director |
| Production | William Hanna | Producer |
| Directing | Joseph Barbera | Director |
| Production | Joseph Barbera | Producer |
| Writing | Warren Foster | Story |
