'Arrow' season 5 spoilers: Black Siren, Deathstroke return in the remaining episodes of season 5

Promotional photo for "Arrow" season 5 Facebook/CWArrow

The preview for the final episodes of "Arrow" season 5 has been released, and it features a lot of returning characters for the mystery crime action series.

Based on the 2:03-minute clip, Malcolm Merlyn (John Barrowman), Laurel Lance's alter ego the Black Siren (Katie Cassidy), the al Ghul sisters Nyssa (Katrina Law) and Talia (Lexa Doig), and Deathstroke (Manu Bennett) will return in the remaining episodes of "Arrow" season 5.

Yao Fei (Byron Mann), Cody Rhodes (Cody Runnels) and Konstantin Kovar (Dolph Lundgren) also appeared in the trailer, which means that Oliver Queen's (Stephen Amell) enemies will be back to torment him in the show's upcoming episodes.

The trailer also revealed that Oliver and Felicity Smoak (Emily Bett Rickards) will once again reassess their failed relationship after the two got stuck and trapped together. This means that there could be a chance for the two to possibly get back into each other's arms.

Before the events that was featured in the trailer, Oliver and the rest of the Team Arrow will have their hands full when the series returns after its brief hiatus.

According to the synopsis for the upcoming episode called "Dangerous Liaisons," Oliver and Team Arrow will work with ARGUS and the Star City Police Department to look far and wide for Adrian Chase (Josh Segurra).

Felicity will also reportedly get a tip from the hacker group known as Helix regarding the whereabouts of Chase, but they want her to give them something huge and illegal in return. This means that Felicity must bend the law in order to find the district attorney-turned-ruthless hooded archer who will not stop until he manages to destroy and kill the Arrow.

The CW will air the returning episode of "Arrow" season 5 on Wednesday, April 26, at 8 p.m. EDT.

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