"Haunted," this week's episode of "Arrow," has leaked online prior to its Wednesday premiere. TorrentFreak reports the leak appears to have stemmed from a preview copy released by Warner Bros.

This particular episode of "Arrow" is hotly anticipated due to the fact that it introduces Matt Ryan's John Constantine to the Arrowverse. Ryan originally starred in NBC's ill-fated "Constantine" series, which ran for thirteen episodes before cancellation. The CW was able to bring the character to "Arrow" after some negotiation and support from stars and fans alike.

Though the source of the leak is unknown, the episode seems to be a preview copy because of the warning screen that appears before the episode begins. In addition to Warner Bros.' warning that this copy may not be distributed, it reads, "The episode contained on this DVD is a rough cut and is not final. It may be missing key special visual effects, and additional sound effects and music are temporary." The episode has since been uploaded to public and private torrent sites.

Starring Stephen Amell, David Ramsey and Emily Bett Rickards, "Arrow" airs Wednesdays at 8 pm EST on The CW.