Echo Kellum will join the CW‘s “Arrow” in the recurring role of Curtis Holt (aka Mr. Terrific) in season four, Variety has confirmed.

Curtis is described as a technological savant and inventor who works at Palmer Technologies under the supervision of Felicity Smoak (Emily Bett Rickards). As revealed at Comic-Con, Curtis will also be a friend to Felicity, and the show’s first openly gay character. The casting news was first reported by EW.

In the comics, Mr. Terrific is Michael Holt, a self-made billionaire and Olympic gold medal-winning decathlete with genius intellect who becomes a superhero after the death of his wife and unborn child, later going on to lead the Justice Society of America.

Kellum will make his “Arrow” debut in episode 402.

Mr. Terrific isn’t the only new face coming to season four of “Arrow” — according to Comic Book Resources, Alexander Calvert will also appear as DC villain Anarky (civilian name Lonnie Machin), described as “a deranged freelancing criminal who is willing to do whatever it takes to impress a potential employer.” As previously reported, Ra’s al Ghul’s nemesis Damien Darhk (Neal McDonough), will menace Stephen Amell’s Emerald Archer too.

“Arrow” sister show “The Flash” is also beefing up its cast for season two, adding “Masters of Sex” alum Teddy Sears as Jay Garrick, another iteration of the Flash from Earth-Two, and Shantel VanSanten as police officer Patty Spivot, a potential romantic partner for Grant Gustin’s Barry Allen.

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“Arrow” season four premieres at 8 p.m. Oct. 7 on the CW.