Katie Cassidy is the latest Berlantiverse actor to ink one of those cool new deals, by which she is now a series regular across multiple CW superhero shows — namely The Flash, Legends of Tomorrow and her original stomping grounds, Arrow (on which she will appear in the Season 5 premiere).
Wentworth Miller, who transitioned from The Flash to Legends (for a one-season stint), was the first actor to sign such a grounbreaking pact; Arrow vet John Barrowman followed, earlier this month. Both Miller and Barrowman, it has since been announced, will play key roles in Season 2 of Legends, as Captain Cold, Malcolm Merlyn, along with Reverse-Flash (played by The Flash‘s Matt Letscher) and Damien Darhk (Arrow‘s Neal McDonough), form the Legion of Doom.
Shortly after Cassidy’s Laurel Lance was killed off of Arrow this past spring, Cassidy popped up on sister series The Flash, as Miss Lance’s Earth-Two doppelganger, the minxy metahuman Black Siren.
UPDATE: As for Cassidy’s first appearance of the coming TV season, Stephen Amell said at a Sunday Nerd HQ panel that in Arrow‘s season opener, we will find out what Laurel made Oliver promise, before she died. “It’s something that’s going to have a lasting impact not just in our season premiere, but over the next couple seasons of the show,” he said. “It’s very important. It’s going to be critical to whatever the legacy of our show is.”