SEASON FINALE: This hasn’t been a good season for Salem witch Mary Sibley (Janet Montgomery), who, this year, lost her bewitched husband, her power and standing in the community, her last name, and even her child, who was abducted by the evil sorceress Countess Marburg (Lucy Lawless), as the centerpiece of a devil-raising ritual. All the spells and scheming have led up to whatever happens tonight – and with at least four witches on the proverbial Salem battleground (the two others are Tamzin Merchant’s treacherous Anne Hale and Elise Eberle’s been-through-hell Mercy), this ought to be one action-packed, vengeance-packed, hour.