The $81m (£66m) lawsuit brought by Italian director Francesca Gregorini accuses Shyamalan of taking key elements from her 2013 film The Truth about Emanuel.
Director M Night Shyamalan went on trial on Tuesday (14 January) over allegations that he plagiarised from an independent film for his Apple TV + series Servant.
Starring Jessica Biel and Kaya Scodelario, The Truth About Emanuel, played at the Sundance Film Festival when it was first released.
His psychological horror series, Servant, follows the story of a couple who hire an eighteen-year-old girl to help them look after a child.