Popsugar Entertainment This Is Us This Is Us Season 3 Cast Here Are All the New and Returning Stars For This Is Us Season 3 September 25, 2018 by Kelsie Gibson View On One Page Photo 4 of 22 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 4 Niles Fitch as Randall Seeing that next season will focus on the aftermath of Jack's death, it's safe to assume that Fitch will reprise his role as teenage Randall. Previous Next Start Slideshow This Is UsTV