A special unit of the U.S. Marshal's Service is assigned to protect a syndicate hitman who is to testify against his former bosses, who have put out a contract on his life.
| Actor | Role |
|---|---|
 Lee Van CleefIke Scanlon | Ike Scanlon |
 Charles RobinsonDeputy Ted Willoughby | Deputy Ted Willoughby |
 Russell JohnsonCharles Montague | Charles Montague |
 Tony MusanteJoey Faber | Joey Faber |
 Lelia GoldoniLinda Faber | Linda Faber |
 Edward AnhaltAlberto Amarici | Alberto Amarici |
 John AldermanVittorio | Vittorio |
 Jack StarrettGus | Gus |
 Stafford MorganKen | Ken |
| CClay TannerLee | Lee |
 David ProvalRick | Rick |
 Bud DavisRudy | Rudy |
| BBlackie DammettJohn | John |
 Brian CutlerGaynes | Gaynes |
| BBob HeveloneGiff | Giff |
 Rick DanoTom | Tom |
 Vincent Di PaoloFrederico | Frederico |
| HHuguette PateraudeDeputy Bowan | Deputy Bowan |
| JJoe Lo PrestiThe Judge | The Judge |