Producer Andrew Kreisberg has confirmed that Arrow's Felicity Smoak (Emily Bett Rickards) and Ray Palmer (Brandon Routh) will guest-star on an upcoming episode of The Flash

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Emily Bett Rickards. Photo by: Cherie Roberts

Speaking to Variety , Kreisberg said that Felicity and Ray will appear in Episode 18 of The Flash's first season, which is aptly titled "All-Star Team-Up." Kreisberg indicates that the episode will justify Felicity's earlier appearance (in episode four) on The Flash as more than "just a gag," saying, "It really was integrated into the story. When you reach what’s going on in ‘The Flash’ at that point in the season, Barry is really at a crossroads. Having Felicity come by exactly when he needs her really plays into the whole storyline."As for Ray Palmer -- the scientist who comic book fans know as The Atom -- Kreisberg says that the science of STAR Labs will give the character a logical reason to pop up on The Flash. "It’s fine because as [producer] Marc [Guggenheim] said, Ray Palmer is all about technology and STAR Labs is all about technology. We get to see Ray so happy to be in STAR Labs… With Cisco [Carlos Valdes] and Ray, they’re new best friends. The STAR Labs team is going to help Ray further his ATOM project.”"All-Star Team-Up" -- The Flash: Season 1's eighteenth episode -- is expected to air on The CW in March.

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Anthony Couto is a writer for IGN. He co-hosts a podcast about horrible movie sequels – called– which you can “like” on. Ponder with him on Twitter ator on IGN at