Sarah Michelle Gellar recently reunited with her Buffy The Vampire Slayer co-star Alyson Hannigan, and a shared Instagram photo of the pair has sparked calls from fans for Willow Rosenberg’s return in the upcoming Buffy revival series. The two actresses appeared on the Friday, May 9 episode of The Today Show to highlight the importance of protecting children from meningitis, as part of GSK’s Ask2BSure campaign.