Susanna Thompson (born January 27, 1958) is an American actress. She is known for her roles in films Little Giants (1994), Ghosts of Mississippi (1996), Random Hearts (1999) and Dragonfly (2002), and as Karen Sammler on ABC drama series Once and Again (1999–2002). From 2012 to 2014, Thompson starred as Moira Queen as a regular cast member in the CW series Arrow.