sentences:  One story, dubbed "Endgame," involved the culmination of the feud between the Spencer family and Cassadine family, a storyline which had begun in 1981 when Luke and Laura infamously defeated Mikkos Cassadine's weather machine.In the revival storyline, Helena Cassadine revives her deceased son Stavros Cassadine, who had been frozen through the use of cryogenics.The original script had Helena threaten the Spencers along with the rest of Port Charles with a biotoxin, which was quickly deemed inappropriate and dropped.