Oliver's (Justin Hartley) past comes back to haunt him in the form of The Dark Archer (guest star Steve Bacic), Oliver's former teacher, who seeks revenge on his student by taking aim at Lois (Erica Durance) and Chloe (Allison Mack). Oliver faces down The Dark Archer after his former mentor kidnaps Mia AKA "Speedy" (guest star Elise Gatien) but is pushed to his limit and Clark (Tom Welling) races to stop him from making another deadly mistake.