Nothing
S04E01 Green Arrow
Oliver and Felicity's relaxing retreat is abruptly interrupted when Thea and Laurel arrive, urging Oliver to come back to Star City. They inform him that the city is under siege by Ghosts, a group of assassins commanded by the menacing Damien Darhk. Upon Oliver's return, Diggle expresses his strong disapproval of Oliver rejoining the team, making it clear that he wants him out.
Season 4 Episodes
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9
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Green Arrow
The Candidate
Restoration
Beyond Redemption
Haunted
Lost Souls
Brotherhood
Legends of Yesterday (II)
Dark Waters
Blood Debts
A.W.O.L.
Unchained
Sins of the Father
Code of Silence
Taken
Broken Hearts
Beacon of Hope
Eleven-Fifty-Nine
Canary Cry
Genesis
Monument Point
Lost in the Flood
Schism