"25 years ago today I had the honor to introduce the world to my version of Buffy Anne Summers,” she wrote. “It was an uphill battle. A mid season replacement, on a new network based on a movie, that was by no means a giant success. But then there was you. The fans. You believed in us. You made this happen. You are the reason 25 years later we are still celebrating. So today we celebrate you as well. #wwbd."
In July, the star spoke with ET about her children finally being introduced to the teen vampire slayer. "My boy was into it for the villains, and my daughter was into it for the love stories," Gellar shared.