Sort of. The final episode of the series was intended to be a season finale not a series finale. The events of the final episode The efforts to stop someone who had developed a "contagious" form of p-positive status who was on the loose in Seattle. As such he ends up killing half of those he unwittingly infects and giving the other half powers. The authorities, overwhelmed by the chaos caused, ask Jordan Collier and his people for help maintaining order. After the contagious individual is isolated, many of the NTAC personal have become p-positive and Jordan Collier's "Promise City" has expanded its reach over much of Seattle. So the finale resolved some of the extant storyline and didn't end on a cliffhanger, but it didn't fully resolve the storyline and introduced elements which would have been the basis for another season if the show had been renewed.