Principal Greta McGee is a character from Grease. She is principal of Rydell High School.
Strict, authoritative, but willing to (somewhat) boogie on down during Rydell's parties, especially the 1959 National Bandstand Dance-off.
She was attractive in a Lucille Ball kind of way; Dressed conservatively, her brown-then-later-coppery red hair usuallly done up in a tight bun (Grease) or large, wide bun (Grease 2).
Though generally stern in personality, she seems to forgive minor infractions.