Arrow Season 2

In season two, Oliver has vowed to stop crime without killing criminals, and comes under attack from Slade Wilson (Manu Bennett), a man from Oliver's time on the island who resurfaces with a vendetta against him. Oliver must also contend with outside forces attempting to take over Queen Consolidated, guilt from decisions he made in the past, and secrets harbored by his family and friends. Oliver grows to accept aspiring vigilante Roy Harper (Colton Haynes) as his protégé, and begins to receive assistance from Laurel's father, Officer Quentin Lance (Paul Blackthorne). Ollie also receives assistance from a female vigilante, who is eventually revealed to be Laurel's sister, Sara Lance (Caity Lotz), who had survived her ordeal at sea years prior.