Oh, the horror! Procter & Gamble Co.'s Olay has tapped Sarah Michelle Gellar -- in a nod to her roles in Buffy the Vampire Slayer, Scream 2 and I Know What You Did Last Summer -- to star in its first ever Super Bowl ad.

The 30-second "Killer Transformation" spot from Saatchi & Saatchi will air in the first quarter of the game Feb. 3 on CBS. Gellar, 41, is just a tad older than the high end of millennials, who grew up watching her work.

The ad aims both to provoke a bit of nostalgia and drive home that Olay products can produce "unbelievable skin transformation," a spokeswoman says.