Today, Hulu announced that Sissy Spacek and Jane Levy have joined the cast of upcoming Hulu original drama series Castle Rock. Spacek (Carrie) will play Ruth Deaver, estranged adoptive mother of Henry (Andre Holland), a retired professor whose fading memories may hold a key to Castle Rock’s unsettling past. Levy (Suburgatory, Don’t Breathe) will play Jackie, the death-obsessed, self-appointed historian of Castle …