People living at a seashore town are frightened by reports of an unknown creature called "the sea devil". Nobody knows what it is, but it's really the son of doctor Salvator. The doctor performed surgery on his son and now young Ichtiander can live under water. This gives him certain advantages, but also creates a lot of problems.
| Directing | Vladimir Chebotaryov | Director |
| Writing | Akiba Golburt | Screenplay |
| Writing | Aleksei Kapler | Screenplay |
| Writing | Aleksandr Belyaev | Novel |
| Sound | Andrei Petrov | Original Music Composer |
| Writing | Aleksandr Ksenofontov | Screenplay |
| Camera | Eduard Rozovsky | Director of Photography |
| Directing | Gennadi Kazansky | Director |
| Editing | Lyudmila Obrazumova | Editor |
| Art | Vsevolod Ulitko | Production Design |
| Art | Tamara Vasilkovskaya | Production Design |
| Production | Ivan Provotorov | Production Manager |
| Sound | Lev Valter | Sound |
| Crew | Mariya Kandat | Special Effects |
