Dr. Curtis Holt is a bronze medal Olympic athlete and a former employee of Palmer Technologies who worked alongside then-CEO Felicity Smoak in the Design Innovations department. He was the husband of Nick Anastas. After learning of Green Arrow’s secret identity and the location of the Arrowcave, he joined Team Arrow as maintenance and tech support. While searching for Rene Ramirez to have him join the team, he took a beating from a group of street thugs. This inspired him to be trained and go out on the field, not wanting to feel helpless again. During his first time out, Curtis was jokingly called Mister Fair Play, after his favorite wrestler, Terry Sloane, and for his clean tactics. He was later directly named after Sloane’s in-ring name; Mr. Terrific.
After discovering that Oliver, John Diggle, and Felicity had violated his privacy to figure out who betrayed the former to the F.B.I., Curtis left the team along with Rene and Dinah Drake to form their own group known as New Team Arrow. However, the trio eventually rejoined Team Arrow to help Oliver battle Ricardo Diaz. After Oliver was imprisoned, Curtis became the head of research and development at A.R.G.U.S.. Following Oliver’s release from prison, Curtis became a deputized superhero working with the Star City Police Department. Curtis then got a job in Washington, D.C., and relocated thereafter transferring the full rights of Helix Dynamics to Felicity. He also retired from being Mr. Terrific, though occasionally helps Team Arrow as tech support if needed. Curtis later attended Oliver’s funeral to honor his friend.