"I'm Jenn Robinson, director and co-writer, and I don't know if you know who this is — she's a brand new actor, Sarah Michelle Gellar," Robinson quipped, as captured in an Instagram video. She then thanked the crowd for attending the film's opening weekend before advising: "Do not leave before the credits are done. Stay."

This story contains major spoilers from “I Know What You Did Last Summer,” now in theaters. Sarah Michelle Gellar never thought there would be an “I Know What You Did Last Summer” movie released in 2025.

The actress and director Jennifer Kaytin Robinson showed up unannounced during multiple opening-weekend theatrical showings of the new slasher, which is a sequel to the 1997 movie of the same name that starred Gellar, 48, as the doomed Helen Shivers.