Annalise Keating might know How to Get Away With Murder, but when it comes to dealing with the other M word — mutants! — will she prove so adept?

Fans of ABC’s TGIT thriller will find out now that X Men‘s Famke Janssen is joining the cast for a multi-episode arc, TVLine has learned exclusively.

ABC confirmed Janssen’s casting, but declined to provide details of her character. Rumor has it she will be playing a brilliant, revered defense attorney who takes her job very seriously.

Janssen, whose TV credits include Hemlock Grove and Nip/Tuck, is slated to make her Murder debut in the Season 2 premiere on Sept. 24 (10/9c).