The official synopsis for return of season 4 of Arrow has been revealed.

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The episode, titled 'Blood Debts,' will see Oliver (Stephen Amell) out to seek revenge from Damien Darhk (Neal McDonnough).

Here's the official synopsis:

"THE AFTERMATH - Oliver (Stephen Amell) must deal with the devastating consequences of Darhk's (guest star Neal McDonough) last attack. Seeking revenge, Oliver goes on a brutal manhunt looking for Dahrk. Jesse Warn directed the episode written by Oscar Balderrama & Sarah Tarkoff."

The most crucial storyline will have to do with Felicity (Emily Bett Rickards). After Felicity was gravely injured by Darhk's forces and in the preview for the midseason premiere she is seen fighting for life in the hospital, there are suggestions of her possibly dying and her being the mysterious person in the grave, who's death Oliver (Stephen Amell) vowed to avenge.

The teaser for the episode, titled 'Blood Debts,' of the midseason premiere of season 4 shows a distraught Oliver as the fatally injured Felicity is fighting for her life in hospital.

"Now I know it's not my fault, it's my responsibility, to end it I am going to kill him," Oliver's voiceover is heard through the clip.

It seems like Felicity is going to succumb to her wounds, as at the end of the clip Oliver is seen shedding tears over someone's fresh grave. Even though nothing is explicitly stated and we only have visuals to go by, the teaser very strongly hints at the fact that Felicity is six feet under and Oliver is set to take Darhk down.

'Blood Debts' will air on January 20 on The CW.

Watch the teaser:

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Arrow, The cw, Television