Season three of "From Dusk Till Dawn: The Series" continues the Gecko brothers' saga as they fight their way through the chilling world of culebras, the vampire-snake hybrids that control hidden empires in Texas and Mexico. Once the baddest outlaws in the land, Seth and Richie made a run for the Border two years ago to save their lives - and their fortune. After stumbling into a bar full of bloodsuckers and bandits, the Geckos encountered the vampire goddess Santnico, joining her cause to settle an old score. It won them a place in the culebra world. Now that world is on the verge of violent and destructive explosion as new enemies hell-bent on domination gather to take them down. In typical Gecko fashion, Seth and Richie assemble an unlikely crew (some new, some old) to take on the forces of hell.