The much awaited crossover episode of "Arrow" and "Constantine" was allegedly leaked online ahead of its telecast on The CW this Wednesday, 4 November, at 8pm. Episode 5, titled "Haunted", was released on various torrent sites by Sunday, 1 November.

While the reports suggest that a DVD of the episode was leaked online after Warner Bros. Television sent it out to reviewers and journalists for a special screening, the cast and crew of the supernatural series are tightlipped on it.

Meanwhile, the illegal downloads of the pirated version of episode 5 is in full swing. As of Monday, 2 November, it was downloaded more than 11,677 times, reported Variety citing piracy-watching firm Excipio GmbH.

So, it remains to be seen if the illegal downloads of the fifth episode will affect the TRP rating of The CW as it is reportedly an important episode of the fourth season. In the sequel, actor Matt Ryan will reprise his role as John Constantine and play a major role in Queen's (Stephen Amell) life.

CLICK HERE to watch the fifth episode of "Arrow" season 4 online on The CW this Wednesday, 4 November, at 8pm.

The official synopsis of "Arrow" season 4 episode 5, titled "Haunted", reads: "When things take a turn for the worse with Sara (Caity Lotz), Oliver calls in a favour from an old friend who deals in the mystical."

In a sneak peek video, executive producer Wendy Mericle revealed that the upcoming episode will focus on Sara's resurrection. "We're going to see Sara out in the city doing exactly what we expected of her do, which is randomly murdering people. Sara is still being inflicted by the Lazarus Pit side effects and she's still a wild, feral animal who is determined to kill and she's unstoppable," she said.

Mericle even teased it will be a very dark episode of "Arrow" season 4, which shows Laurel (Katie Cassidy) grappling with her decision to bring her sister back from the dead and try to put this genie back in the bottle. "We're very excited that the only solution for doing that is bringing on John Constantine and he's going to be the key to bringing Sara back and bringing her soul back," she added.

Watch the trailer of  "Arrow" season 4 episode 5, titled "Haunted", below: