The team faces off against a formidable villain nicknamed The Calculator. Meanwhile, Nyssa makes her move and Roy Harper returns to Star City.
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12. Unchained - The team faces off against a formidable villain nicknamed The Calculator. Meanwhile, Nyssa makes her move and Roy Harper returns to Star City.
More infoOliver and Felicity's blissful getaway is cut short with a cry for help.
When an old friend tells Oliver that she is going to run for mayor, he's concerned.
The growing tension between Oliver and Diggle puts both their lives at risk.
Laurel must deal with the repercussions of taking Sara to Nanda Parbat.
When things take a turn for the worse with Sara, Oliver calls in a favour.
Felicity is frantic when she learns that Ray Palmer being held by Damien Darhk.
Team Green Arrow's ongoing battle with Damien is complicated by a shocking revelation.
Oliver takes Kendra Saunders and Carter Hall to a remote location to keep them hidden.
After the city is attacked again, Oliver makes a bold move against HIVE.
Oliver must deal with the devastating consequences of Darhk's last attack.
Diggle must learn to trust his brother Andy when an enemy appears.
The team faces off against a formidable villain nicknamed The Calculator.
Oliver receives an offer from Nyssa that he finds hard to refuse.
Oliver and the team uncover HIVE's plan to take out Team Arrow once and for all.
Realising he needs help, Oliver calls in an old friend - Vixen.
A heartbroken Cupid returns with one goal - to destroy anyone in love.
Brie Larvan breaks out of jail and turns up at Palmer Tech threatening to kill everyone.
Oliver and Diggle learn that Merlyn is going to break Darhk out of prison.
Oliver and the team struggle to come to terms with a death, especially Diggle.
Consumed with guilt, Diggle seeks revenge against Andy.
Team Arrow learns what Damien Darhk's devastating next move is.
Oliver and Diggle race to rescue Thea, and Felicity, Curtis and Noah must join forces.
Oliver teams up to stop Darhk in the season four finale.