Boris "Kos" Kosinski (Eryk Lubos) is a top MMA fighter. In the biggest battle of his life with his greatest rival, Denim Takaev (Mamed Khalidov), he makes a mistake that destroys his entire career. He loses everything. This failure brings him through a series of ups and downs, but it also pushes him to undertake a titanic effort to fight and win back respect and love
Unfortunately the movie Underdog is not yet available on HBO Max.
| Directing | Maciej Kawulski | Director |
| Crew | Jarosław Golec | Stunt Coordinator |
| Production | Hubert Chybowski | Assistant Production Manager |
| Camera | Bartek Cierlica | Director of Photography |
| Production | Ewa M. Pawłowska | Production Manager |
| Production | Robert Kijak | Co-Producer |
| Production | Tomasz Mandes | Casting |
| Production | Tomasz Mandes | Producer |
| Crew | Ewa Lewandowska | Public Relations |
| Production | Ewa Lewandowska | Producer |
| Writing | Mariusz Kuczewski | Writer |
| Sound | Kacper Habisiak | Sound Director |
| Sound | Jacek Wiśniewski | Foley Recordist |
