Oliver celebrates Thanksgiving with his family but the happy moment is interrupted. Meanwhile, Black Siren returns to wreak havoc on the holiday.

As Slade continues to uncover clues about his sons last few years, Oliver makes a big decision. Meanwhile, the Green Arrow leads the team into battle against The Dragon, a villain who is stealing valuable tech in Star City.

Slade returns and asks Oliver for help tracking down his son, the rescue mission gets complicated by a terrible revelation that could shatter Slades hopes of reunion and Vigilante reappears in Star City.

Black Siren launches another attack on Star City just when Oliver has gotten things in order.

A rogue black ops team led by Onyx breaks into Kord Industries and steals something lethal. Oliver struggles to connect with William so he reaches out to a surprising source for help.

Anatoly returns to Star City with a sinister agenda as Oliver tries to balance being the mayor, the Green Arrow and William's father.

Oliver deals with the fallout of the explosion on the island.

Oliver assembles a group of unlikely allies Slade, Nyssa, Merlyn and Digger Harkness to engage in an epic battle against Chase and his army.

Black Siren returns to give Chase help, Felicity plans a birthday party for Oliver, Lance is angry with Rene for missing the custody hearing about his daughter.

Oliver faces the forced release of criminals prosecuted by Adrian Chase, while a crate is delivered to Oliver's office containing a corpse in concrete.