Catalyst is the second episode of The Sulez Dynasty Season 3 and the 15th episode overall.
1st Hour- A DARK TRUTH IS REVEALED- Tristan de Martel kidnaps Meredith Sulez, Josephine Salvatore, and Henrietta Feyers and subjects them to "re-conditioning therapy". Enzo and Sage come to blows over Enzo's divided loyalties concerning the Strix and Josephine and her child, and Olivia Archer pays Rachel Davies a visit.
2nd Hour- STRANDED BEHIND ENEMY LINES- With his friends and sister in the clutches of Tristan de Martel, Enzo storms the Strix compound in Cambridge. Tristan continues "reconditioning" his guests and takes a special interest in Josephine Salvatore and her unborn baby. Elijah Mikaelson comes to Boston on Tristan's invitation to a Strix gala. Olivia Archer meets Tristan's sister, Aurora.
FLASHBACK STORYLINE- In an episode consisting mostly of flashbacks, the origins of the Organization of Hunters is revealed.
- Shelley Hennig as Meredith Sulez
- Oliver Ackland as Tristan de Martel
- Michael Malarkey as Lorenzo Meddenhall
- Indiana Evans as Josephine Salvatore
- Michelle Ryan as Katherine Pierce
- Amanda Schull as Henrietta Feyers
- Scarlett Byrne as Nora Fairchild
- Teressa Liane as Mary Louise Fairchild
- Rebecca Breeds as Aurora de Martel
- Tracy Cole as Sofya
- and Sophia Bush as Olivia Archer
- Daniel Gillies as Elijah Mikaelson
- Edgar Ramirez as Salvador Sulez
- Tricia Helfer as Sonja Moran
- Krysten Ritter as Natasha Elkin
- Andrew Lees as Lucien Castle
- Cassidy Freeman as Sage Meddenhall
- Riley Voelkel as Freya Mikaelson
- Crystal Reed as Joanna
- Haley Ramm as Ariane
- Hilarie Burton as Rachel Davies
- Timothy Omundson as Cain (flashbacks)
- Katrina Law as Nyssa al Ghul (flashbacks)
- and Peter Mensah as Peter Delsoin (flashbacks)
- Antagonist: Tristan de Martel