The fifth episode from season four of the popular TV-series "Arrow" leaked online a few hours ago. The leak comes from a preview copy that was sent out for review by Warner Bros. and features the first appearance of DC Comics' John Constantine.

With millions of downloads per episode, Arrow is one of the most pirated TV-series of the year.

Featuring the DC Comic character Green Arrow the show is currently in its fourth season.

Many fans of the show are looking forward to the next episode later this week, where another DC Comic character will make his appearance. After a failed series on NBC, John Constantine will join the Arrow storyline.

Interestingly, not all fans will have to wait this long as thousands just jumped on a leaked copy that appeared online earlier today. Even though TV-show leaks are relatively rare, the fifth episode of Arrow was uploaded to public and private torrent sites a few hours ago.

The source of the leak is unknown but a warning screen at the starts shows that it originates from a preview copy, which was sent out for review by Warner Bros. Television.

The message warns the viewer not to distribute the video to third parties and suggests that the leaked version is not the final cut.

“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,” it reads.

However, judging from the comments online the copy is fairly complete.

“Good copy, great episode, will grab the episode this week to see the changes but it doesn’t look like there will be much,” one commenter notes.

The video quality isn’t particularly great, which is usually the case with these type of leaks. Still, that won’t deter many from having a sneak peek.

Whether the leak will hurt the ratings, or if it will serve as a promotion for the “most important” episode of the season remains up for debate.