The accomplice assisted Dr. Webb in the making and selling of Vertigo. When The Hood arrived at the mental institution to investigate the operation, the Accomplice came up behind him and knocked him out. He then witnessed Dr. Webb, who removed The Hood's hood and discovered his true identity, Oliver Queen. With Oliver captured, Webb gave the Accomplice orders to open Oliver's mouth so he could give him liquid Vertigo. However, Oliver escaped with the help of his partner John Diggle who arrived and struggled with the Accomplice. During the struggle, Diggle dropped his gun, but before the Accomplice could use it, Diggle killed him with a heart defibrillator by shocking him on his head.
- Peak of human physical condition: He was shown to be in top physical condition. Fighting John Diggle and using his strength to keep up with him.
- Skilled hand-to-hand combatant: He was shown to possess some skill in hand-to-hand combat. went toe-to-toe with John and almost won before he got electrocuted and killed.
- Stealth: Despite his size he could move silently and was even able to sneak up on The Hood without getting noticed.