When Shotgun Gibbs' mule falls ill, Dr. McCarty can't do anything so Wyatt calls in his old friend, Doc Fabrique. When Fabrique discovers that it's a case of poisoning, Shotgun hunts down the men responsible.
| Name | Type | Role | |
|---|---|---|---|
| Frederick Hazlitt Brennan | Writer | ||
| Harry Harvey Jr. | Guest Star | ||
| Douglas Fowley | Guest Star | ||
| Sam Flint | Guest Star | ||
| Bill Cassady | Guest Star | ||
| Frank McDonald | Director |