In 2015, Kellum was cast in the recurring role of Curtis Holt, based on the DC character Mister Terrific, in the fourth season of The CW drama series Arrow. Curtis is a technological savant and Inventor who works at Palmer Technologies under the supervision of Felicity Smoak, and later becomes a member of Team Arrow. In April 2016, it was announced that Kellum would be promoted to series regular for the fifth season of Arrow.
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