The fifth season of Arrow is set to be terrific.
Echo Kellum, who plays Palmer Tech genius Curtis Holt, has been promoted to be a series regular from the beginning of next season, per TVLine (warning: spoilers for episodes yet to air in the UK feature in this link).
In the comic books, a character named Michael Holt takes on the superhero persona of Mr. Terrific. When Kellum was cast, that alter-ego was given as Curtis’ ‘also known as’ name. With him becoming a regular next season, we could be in line to see him expand his abilities from the keyboard to the streets of Star City.