• Matt Ryan is John Constantine in "Constantine."

Matt Ryan is John Constantine in "Constantine." (Photo : Instagram/nbcconstantine)

John Constantine, who is played by "Flypaper" actor Matt Ryan, is set to reach Oliver Queen's universe in the television series "Arrow."

According to Cinema Blend, Constantine's arrival to the series' was one of the biggest explosive events this Season 4. CW had given fans a look at the skeptical occult detective at the New York Comic Con last weekend and he did not appear different from the character's version in NBC. The studio just had a glimpse on the character, which did not indicate massive information about his impact to the "Arror" plot.

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Constantine's is set to appear in "Arrow" Season 4 Episode 5, which is entitled "Haunted." It has been reported that the detective's appearance in the series would not be a simple cameo, as the episode has been regarded as a crossover between the "Arrow" and "Constantine" realms. While fans are going to bid farewell to Constantine soon, they assume to see more of the character sometime in the future.

Meanwhile, Season 4 Episode 2, which is entitled "The Candidate," follows an old family friend Jessica Danforth as she informs Queen and Thea Queen that she is going to run as mayor, according to Spoilers Guide.

Oliver and Thea become worried for Danforth, since the last three mayors have been assassinated. Danforth still pushes through with her announcement, so Green Arrow and Speedy promise to defend her.

Thea starts to display effects from the Lazrus Pit while Smoak faces a challenging entrepreneurial decision, with the latter prompted to ask help from her employee Curtis Holt.

John Behring's "Arrow" Season 4 Episode 2 "The Candidate" is slated to hit the small screen on Oct. 14.