Grant Gustin's 'Flash' Co-Stars to Guest on 'Arrow' in April!

Grant Gustin flashes a peace sign as he leaves Cafe Artisiano with some takeout in hand on Tuesday (March 18) in Vancouver, Canada.

The 24-year-old actor is currently in the midst of filming his upcoming CW show The Flash. It was just announced that several characters from The Flash will be part of CW’s Arrow for a crossover episode!

Episode 19 of Arrow, titled “The Man Under the Hood,” will introduce Flash characters S.T.A.R. Labs’ bioengineering expert Caitlin, played by Danielle Panabaker, and mechanical engineering genius Cisco, played by Carlos Valdes, according to THR.

“It allows us to further flush out The Flash universe in Arrow,” Arrow executive producer Marc Guggenheim said of the “important appearance.” He added about the April episode, “we get to see their dynamic.”

10+ pictures inside of Grant Gustin showing some peace…