Under the influence of the Leviathans, Amy (Denise Nickerson) and Elizabeth (Joan Bennett) lock Maggie (Kathryn Leigh Scott) in the tower room. When Barnabas' former servant, Willie Loomis (John Karlen), returns to Collinwood, he is imprisoned along with Maggie -- and, like her, must sit by helplessly as the Leviathans again make their presence known. This episode first aired on February 23, 1970.