A member of Team Arrow is set to transfer over to Team Flash -- for a night, anyway. According to TVLine, Arrow's Felicity Smoak will guest star in The Flash Season 4's fifth episode.

"The girls [including a visiting Felicity Smoak] go and have a night out in Central City alone, without the guys," revealed Flash executive producer Todd Helbing. "And they get into some trouble.”

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Helbing also teased that the episode, titled "Girls Night Out," could be related to Iris' pending nuptials. Asked if the circumstances may have something to do with her bachelorette party, Helbing said only, "Possibly."

"Girls Night Out" will likely feature several female members of The Flash cast, like Caitlin Snow. It's also possible we could see the dimension-hopping Gypsy, who is slated to return due to her relationship with Cisco, and the Earth-2 speedster Jesse Quick.

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Felicity has been a main cast member on Arrow since Season 1. As a member of Team Arrow and the on-again, off-again love interest of Oliver Queen, she has been involved with Team Flash a number of other times; she has physically appeared with The Flash cast in seven episodes total, including the crossover tie-ins.

Returning Tuesday, Oct. 10, at 8 p.m. ET/PT on The CW, The Flash stars Grant Gustin as Barry Allen, Candice Patton as Iris West, Jesse L. Martin as Joe West, Tom Cavanagh as Harrison Wells, Carlos Valdes as Cisco Ramon, Danielle Panabaker as Caitlin Snow and Keiynan Lonsdale as Wally West.