Marvel TV will have soon introduced four "street-level" superheroes (Daredevil, Jessica Jones, Luke Cage, and Iron Fist) to the Marvel Cinematic Universe through its Netflix series. The plan from the get-go was to eventually unite them with a Netflix crossover mini-series, titled The Defenders. And now, that is exactly what is happening.
The Defenders is slated to begin filming near the end of this year and has already secured its showrunners, in the forms of Douglas Petrie and Marco Ramirez: the duo that oversaw season 2 of Marvel's Daredevil series. Starring in the Defenders TV "event" will be Charlie Cox as Matt Murdock/Daredevil, Kristen Ritter as Jessica Jones, Mike Colter as Luke Cage, and Finn Jones as Danny Rand/Iron Fist. It's not clear yet if Jon Bernthal's Punisher will also make an appearance.
Marvel debuted the teaser trailer for The Defenders during its San Diego Comic-Con 2016 panel for Luke Cage, but the video is now available for watching online (see it above). Said teaser also confirms that the heroes of Hell's Kitchen (and Harlem, in Cage's case) will unite sometime in 2017 and, it would appear, so will Scott Glenn as Matt's curmudgeonly "mentor" Stick - heard speaking in the Defenders teaser, saying "You think the four of you can save New York? You can't even save yourselves," to the eponymous team.
The upcoming freshman seasons for both Luke Cage and Iron Fist will explore their namesake's origins, much in the same way that Daredevil season 1 and Jessica Jones season 1 did before them. By the time those seasons are done, we ought to have a clearer picture of what the threat is that brings New York's "gifted" individuals together to save the day.
Daredevil creator Drew Goddard is also serving as an executive producer on The Defenders, along with Marvel TV head Jeff Loeb. Here is the statement previously released by Loeb, regarding the Marvel/Netflix TV mini-series event:
“We’re incredibly excited to be able to bring our four street level heroes together in an epic tale woven by Doug and Marco whose work on ‘Marvel’s Daredevil’ speaks for itself. They write and produce not only great action and adventure, but also the heart and touch of humor that’s makes us Marvel. With the inclusion of Drew Goddard, we’ve got a team that’s as formidable as the Defenders themselves.”
Daredevil season 1 & 2 and Jessica Jones season 1 are now available on Netflix. Luke Cage season 1 will arrive on September 30th, 2016. The Defenders and Iron Fist arrive in 2017. Release dates for Jessica Jones season 2, The Punisher and Daredevil season 3 have not yet been announced.