When Shotgun's mule Roscoe is injured during the theft of Army mules and horses, Wyatt turns to the mule to solve the case.
| Name | Type | Role | |
|---|---|---|---|
| Frederick Hazlitt Brennan | Writer | ||
| James Seay | Guest Star | ||
| Clancy Cooper | Guest Star | ||
| Jock Gaynor | Guest Star | ||
| Paul Jasmin | Guest Star | ||
| William Keene | Guest Star | ||
| Roy Rowland | Director |