Popsugar Entertainment Succession Succession Season 3 New and Returning Cast The Succession Season 3 Cast Is Stacked! See Who's Joining and Who's Returning 7 May 2021 by Monica Sisavat Solís View On One Page Photo 10 of 15 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 10 Kieran Culkin as Roman Roy Also returning is Culkin as the one and only Roman. Previous Next Start Slideshow SuccessionHBOTV