Prinses Sira (Wandisa Guida) is op weg om te trouwen met de kwaadaardige koning Zagro (Livio Lorenzon ). Zagro wil namelijk haar koninkrijk overnemen. Koning Zagro's geliefde wil het huwelijk verhinderen en probeert Prinses Sira uit de weg te ruimen. Gelukkig is Hercules in de buurt om haar te beschermen.
Nee, helaas is La vendetta di Ursus nog niet beschikbaar op Netflix in Nederland.
| Directing | Luigi Capuano | Director |
| Writing | Marcello Ciorciolini | Screenplay |
| Writing | Roberto Gianviti | Screenplay |
| Writing | Giovanni Scolaro | Screenplay |
| Camera | Oberdan Troiani | Director of Photography |
| Sound | Carlo Innocenzi | Original Music Composer |
| Writing | Marcello Ciorciolini | Story |
| Art | Alfredo Montori | Production Design |
| Art | Camillo Del Signore | Set Decoration |
| Costume & Make-Up | Antonia Quilici | Costume Design |
| Directing | Gianfranco Baldanello | First Assistant Director |
| Directing | Nellita Zampieri | Script Supervisor |
| Crew | Franco Fantasia | Master at Arms |
| Costume & Make-Up | Duilio Scarozza | Makeup Artist |
| Costume & Make-Up | Adriana Cassini | Hairstylist |
| Production | Augusto Dolfi | Unit Manager |
| Production | Giulio Pappagallo | Unit Manager |
| Camera | Mario Sensi | Camera Operator |
| Camera | Luigi Troiani | Assistant Camera |
| Sound | Mario Del Pezzo | Sound |
| Editing | Antonietta Zita | Editor |
| Production | Ferdinando Felicioni | Production Manager |
