Desc: Tidal: The Head of the Snake: Directed by Kate Vargish. With Kate Vargish. TIDAL follows a diverse group of people in 1992 that have organized themselves into 'Chapters,' with the common goal of ridding their cities of hate crimes. Gunnar and Eliza (two members of the Seattle Chapter) can predict these crimes before they happen, until they see something that ends up not happening (at least not yet.)