Principal Greta McGee is a character from Grease. She is principal of Rydell High School. She is strict, but fair, and somewhat willing and able to take part at Rydell's parties, especially the 1959 National Bandstand Dance-off. She even announced Rule 3 of the dance contest: "Anyone doing tasteless or vulgar movements will be disqualified!"
Although she has a stern disposition, she is willing and able to forgive minor infractions.