With the massive success of Guardians of the Galaxy this past year, and the gargantuan hype leading up to Avengers: Age of Ultron, there’s been endless talk about a possible crossover between the two Marvel franchises. Most of us expect them to come together in some capacity eventually, despite James Gunn’s protestations that Guardians does not exist solely to serve the Avengers world, but that ball might get rolling sooner than we thought. Like maybe this May, when Ultron drops.

Possible spoilers below.

Last night was the championship game of the inaugural college football playoff, and while the game was kind of a turd (unless you’re an Ohio State University fan, then it totally ruled), there was one big highlight for movie fans, a brand spanking new trailer for Marvel’s Avengers: Age of Ultron. And it’s awesome. But don’t take our word for that, check it out for yourself.

Now that Guardians of the Galaxy has hit huge at the box office—the record-breaking weekend haul is more than $94 million domestically and north of $160 million world wide—the future of Marvel’s latest franchise looks bright. Guardians of the Galaxy 2 already has the green light and a July 28, 2017 release date on the schedule, but there’s even more in the works. The comic book giant already has plans in place for a crossover between the Guardians crew and The Avengers.

Pumping up the film, members of the cast and crew sat down for an interview with Yahoo U.K. When the subject of a potential tag team partnership came up, they confirmed that there have been continuing discussions, and that there is already a potential storyline in place. Though this sounds like it is going to go down, James Gunn, writer/director both Guardians and Guardians 2, teased that it’s possible that there might be some members missing from both sides.

Marvel’s Guardians of the Galaxy doesn’t even open for another almost two weeks, but it’s still at the forefront of everyone’s mind. The space adventure screened over the weekend for some critics and people can’t shut up about it. From all accounts it’s as good as we all hoped it would be. Tracking for a successful $60 million dollar opening weekend, people are already talking about the future of the franchise. Marvel head honcho Kevin Feige has come out as teasing one possible future team up, and director James Gunn has put the brakes on rumors of another potential story line.

There may be some things that you will consider SPOILERS beyond this point, not only for Guardians, but also future endeavors in the Marvel Cinematic Universe, just in case you want to bow out now.

In 2012, when the credits rolled on Joss Whedon’s The Avengers, the film going world scratched their collective heads and asked, “Who the hell was that big scary dude out in space?” Fans of the comics were well aware that we were looking at Thanos, something everyone else soon figured out as well. Since then we’ve learned that the Mad Titan, as he is also known, is going to play a big part in the Marvel Cinematic Universe moving forward. That role is going to start in earnest when the comic book studio drops James Gunn’s adaptation of Guardians of the Galaxy later this summer, and we’re learning just how big a part he will play in that movie.

We knew that Thanos would be in the film, and played by a different actor than the one at the end of The Avengers. In fact, with less than two months until Guardians hits theaters, Josh Brolin was just cast in the role, which is fantastic news, because Brolin is incredible. He won’t be the key villain this time out, more of an overarching enemy over the course of multiple movies. He has touched the lives of many of the Guardians team, most notably Gamora (Zoe Saldana) and Drax (Dave Bautista), as well as some of the film’s antagonists, especially Karen Gillan’s Nebula.

Last summer, The Avengers hinted at the direction Marvel’s Cinematic Universe would take in Phase Two. A mysterious purple-skinned alien cracked a smile to the audience to usher in a new era of cosmic Marvel movies. The alien was the Mad Titan Thanos, the personification of death and mortality.

After the announcement that Marvel was making a Guardians of the Galaxy movie, it was assumed that he would play a role in that, and also might be the main villain in The Avengers 2. But when Joss Whedon announced that the new title for The Avengers sequel would be Age of Ultron, that line of thinking seemed to be out the window. When will Thanos make actually get a proper introduction in the Marvel movies after being teased in the first Avengers film? Apparently, we could see the Mad Titan in Phase Three, as the main villain in The Avengers 3.

During the press junket for Thor: The Dark World, Marvel producer and president Kevin Feige hinted at the whereabouts of and plans for Thanos. Kofi Outlaw from ScreenRant surmised that the clues such as the Tesseract in Phase One led to Loki’s mind-control scepter in The Avengers. Phase Two also has clues and items that will lead to the robot villain Ultron, so it seems that the same setup in Phase Three could lead to the Infinity Gauntlet, which made a brief appearance in the first Thor movie in 2011. Feige said: