Buffy's Charisma Carpenter yet again blasts 'tyrannical narcissist' Joss WhedonBuffy the Vampire Slayer star Charisma Carpenter has hit back at Joss Whedon after he adamantly denied "toxic work behaviour" accusations. Buffy's Sarah Michelle Gellar was 'pitted against' Willow actor Alyson HanniganBuffy the Vampire Slayer star Sarah Michelle Gellar has said she was "pitted against" co-stars including Alyson Hannigan (Willow).