A man who has a talking mule gets a job on a newspaper, and both get mixed up in a murder trial.
| Actor | Role |
|---|---|
 Donald O'ConnorPeter Stirling | Peter Stirling |
 Yvette DuguayMaria Scola | Maria Scola |
 Gene LockhartTom Henderson | Tom Henderson |
 Nancy GuildAlberta Ames | Alberta Ames |
 William HarriganInspector Hansen | Inspector Hansen |
 Silvio MinciottiSalvatore Scola | Salvatore Scola |
 Lowell GilmoreJefferson Garnet | Jefferson Garnet |
 Larry GatesDan Austin | Dan Austin |
 Hanley StaffordDr. Goodrich | Dr. Goodrich |
 Gale GordonEvans | Evans |
 Forrest LewisJudge Stanley | Judge Stanley |
 Chill WillsFrancis (voice) (uncredited) | Francis (voice) (uncredited) |
| CCharles FlynnJones | Jones |