The Ruining is a six-hour miniseries that serves as the climax of the crossover storyline known as The Convergence.
- Stephen Amell as Oliver Queen (Earth-19)
- Joseph Morgan as Niklaus Mikaelson
- Daniel Gillies as Elijah Mikaelson
- Shelley Hennig as Meredith Sulez
- Claire Holt as Rebekah Mikaelson
- Jensen Ackles as Dean Winchester (Earth-7) & Dean Winchester.
- Katie Cassidy as Laurel Lance
- Willa Holland as Thea Queen
- Ian Somerhalder as Damon Salvatore
- Katrina Law as Nyssa al Ghul
- Michelle Ryan as Katherine Pierce
- with Jared Padalecki as Sam Winchester
- and Sophia Bush as Olivia Archer
- Emily Swallow as Amara
- Olivia Wilde as Celine Laurent
- Yvonne Strahovski as Sariel
- Oliver Ackland as Tristan de Martel
- Rebecca Breeds as Aurora de Martel
- Andrew Lees as Lucien Castle
- Mark Sheppard as Crowley
- Italia Ricci as Scandal Savage
- Nathaniel Buzolic as Kol Mikaelson
- Sendhil Ramamurthy as Davos
- Neal McDonough as Damien Darhk
- Misha Collins as Castiel
- David Ramsey as John Diggle
- Yasmine al-Bustami as Monique Deveraux
- with John Barrowman as Malcolm Merlyn & Malcolm Merlyn (Earth-7)
- and Lee Pace as Abraxas
- Multiple deceased characters will appear.
- This miniseries serves as the grand finale of the CW multiverse.