What is the name of the actress who starred in Black Christmas alongside Co-Star Jessica Harmon? 
Jessica Harmon:  She co-starred in the slasher flick "Black Christmas" as Megan Helms. Black Christmas (2006 film): Black Christmas (abbreviated as Black X-Mas) is a 2006 American-Canadian slasher film written and directed by Glen Morgan and starring Katie Cassidy, Michelle Trachtenberg, Mary Elizabeth Winstead, Oliver Hudson, Lacey Chabert, Kristen Cloke, and Andrea Martin.
i don't know