Professor Helena Xagliv is the Professor of Art History at Friedkin University.
Xagliv has pale, sickly greenish-grey skin, wears a burgundy brown pants suit and uses a black curly octopus-like wig to cover her hair loss from alopecia.
She first appears in Mystery, Incorporeal. Due to her name being "Vilgax" spelled backwards and her wig resembling Vilgax's tentacles, the heroes mistake her for being Vilgax in disguise and assume her to be the villain of the episode.
In Charm School, when Hex becomes a teacher, she flirts with him and tries to asks him out for tea. He becomes disgusted at the thought. After he's turned into a totem by Charmcaster, she asks where Hex is.
Ben 10: Omniverse
- Mystery, Incorporeal (first appearance)
- Charm School
- Third Time's a Charm
- The Most Dangerous Game Show (cameo)
- Rook points out that her name is Vilgax spelled backwards.
- She, Myaxx and Bill Gacks have all been mistaken for Vilgax at some point.