When Leonor Kensington committed suicide, her 37 pet cats and daughter Wilhelmina received her entire state. Wilhelmina was introduced as an 11-year-old pageant and martial arts enthusiast with no morality at all.
She was in there when Kade Kilgore negotiated with the alien Bushels, and she was responsible for slaughtering all of them and reclaimed her new alien pets from them that she named "kitty." Using these creatures, the new Hellfire Club attacked and neutralized a heavy hitters group of the X-Men during the Museum of Mutant History's opening in San Francisco. She beat Emma Frost with her "kitty" creature.
X-men: Battle of the Atom
Wilhelmina is featured in the mobile card game "X-Men: Battle of the Atom" based on the comic book story with the same name. Her cards are:
- Wilhelmina Kensington
- [Siege Agent] Wilhelmina
She is also a boss in the Hellfire missions.