Answer
In the 1974 horror film "Black Christmas," Margot Kidder portrayed the role of Barbara "Barb" Coard. The film follows a group of sorority sisters who are terrorized by a mysterious caller during the Christmas season. Barb is the level-headed and practical roommate of Jess, the film's protagonist. Throughout the film, Barb provides emotional support to her friends and actively participates in the investigation into the caller's identity.