TVLine have reported that Arrow alum John Barrowman has become promoted to being a series regular for all of The CW’s DC shows. Similar to Legends of Tomorrow‘s Wentworth Miller.
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.
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.
Source: TVLine