Catalyst is the akumatized villainess of Nathalie Sancoeur.
- Nathalie's akumatized form, Catalyst, was first revealed in a promotional video for Season 2 from TFOU.
- Catalyst also shares a resemblance with the Collector's design as they both have purplish skin, red glass over their eyes and black dress suits with stiff shoulders.
- Catalyst is so far the only akumatized villain not to be defeated by the French Miraculous superhero team and the only one they are not aware of.
- Catalyst is also the first akumatized villain to enter Hawk Moth's lair, aside from The Collector.
- She is also the first akumatized villain who didn't directly fight Ladybug and Cat Noir.
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