With production getting under way onSeason 4ofArrow, The CW series has just added yet another new cast member, bringing aboardEcho Kellumto play Curtis Holt, a.k.a. Mr. Terrific. The actor will have a recurring role on this new season ofArrow, first appearing in the second episode. It isn’t known how many episodes he has signed on for in total, or if there is an option for him to become a series regular in Season 5.

Entertainment Weeklydescribes Curtis Holt as a “technological savant and inventor,” who works for Palmer Industries under the supervision of Felicity Smoak (Emily Bett Rickards). You may recall that, in theSeason 3finale, both Oliver Queen (Stephen Amell) and Felicity were seen driving away from Starling City together, supposedly starting a new life together. But it apparently doesn’t take the couple long to go back home. It remains to be seen how long it will take for Curtis to transform into Mr. Terrific whenArrow Season 4debuts this October.

In theDC Comics, Mr. Terrific’s true identity was Michael Holt, who first appeared in a 1997 issue ofSpectre. Holt was mentioned in the comics as being the third smartest man on Earth, who has a knack for picking up complex skills instantly. He was also an Olympic athlete who joined the Justice Society of American after the death of his wife and unborn child. While he doesn’t have any super-human abilities, he is aided by “T-spheres,” small robotic devices which allow him to fly and can be used as weapons as well. Holt was actually the second person to take up the Mr. Terrific persona, following the Golden Age hero Terry Sloane.

Echo Kellum’s casting comes just a few days afterNeal McDonoughsigned on to play the primary villain inSeason 4,Damien Dahrk. The show’s cast and producers also revealed new costumes for bothArrowand Diggle (David Ramsey). Production is already under way, withSeason 4slated to debut on Wednesday, October 7.

Echo Kellumis best known for his roles in Fox’s Ben and Kate and Sean Saves the World. He has also voiced a number of characters inRick and Morty, and he most recently had a multi-episode arc on NBC’s A to Z. What do you think about Mr. Terrific being cast in this upcoming season ofArrow? WhatDC Comicscharacter do you think they should cast next?