TVLine has learned exclusively that akin to the groundbreaking contract that Wentworth Miller segued into at the end of his single-season Legends of Tomorrow run, Barrowman will continue to appear on Arrow and maintain series regular status — but across all of the superhero shows executive-produced by Greg Berlanti, including The Flash and Legends.
“What it really emulates to us is the comic books themselves, where there really are a cast of characters,” Berlanti said in May, when Miller’s own deal was announced. “In success, we hope to continue with other characters finding their way across all the shows.”
Barrowman recurred on Arrow‘s first two seasons, including as Oliver’s primary Season 1 adversary, then was promoted to series regular starting with Season 3. During Season 4, he also appeared on The Flash (during the crossover that teed up the DC’s Legends of Tomorrow spinoff) and had a short arc on The CW’s Reign (as the Scottish clan leader Munro).