Italian censorship visa # 80856 delivered on 6 September 1985.
Italian film historian and critic Roberto Curti wrote that the film was "ravaged" by critics and had disappointing box office returns.
Giuliano Gemma spoke negatively about the film after its release, stating that the idea of making the film was good and that he was "delighted to accept it, but I think that, first of all, they made a mistake by choosing to adapt that story, Il signore dell'abisso, because there are such better ones in the series and [several] less difficult to turn into a film."
At the time, a TV series was advertised for which this film was supposed to be the pilot, but the TV network that produced it all (rai3) actually made films for theaters at the time and then two years later created extended versions of the film that they broadcast divided into three parts as if it were a TV miniseries. "Tex and the Lord of the Deep" did so badly in theaters that the planned TV miniseries was never made even though all the scenes had already been shot, it just needed to be re-edited.
Pietro Torrisi was initially chosen to play the main antagonist of the original comic: Prince Tulac. The lack of female roles pushed the production to transform Tulac into a princess, pairing her with the figure of the warmongering sorcerer Kanas, played by Flavio Bucci. Torrisi thus found himself playing a secondary character invented for the occasion.