Sunday is a vampire from the TV series, Buffy the Vampire Slayer. She appeared in the episode "Freshman" as the main antagonist. She was portrayed by Katharine Towne.
Sunday and her gang stalked their prey on the UCSD (aka UC Sunnydale) campus since around 1982. Their MO was to catch their freshman dinner and quickly moved to clean out the victims' dorm rooms and leaving behind notes that said "I can't handle the pressure." Sunday and her gang were eventually slayed by Buffy Summers and her friends. Sunday was taken out by Buffy herself, who threw the handle of a tennis racket into her heart, killing her.