David Ramsey, who plays Diggle in Arrow, hinted at the possibility of another crossover with The Flash in season 4.

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Ramsey tweeted saying that he just visited The Flash writers room, adding it could mean only one thing" "arrow&theflash." He also linked the tweet with an Instagram image of him outside the writers room:

Meanwhile, the official synopsis for the midseason premiere of the show was also recently revealed.

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

Here's the official synopsis:

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"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.

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

Watch the teaser:

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Arrow, The Flash, The cw, Television