The Marvel Cinematic Universe is coming together in a major way when "Avengers: Infinity War" hits theaters in 2018, and now, we know definitively which character will connect with the key Avengers crew for the first time in that flick.

In an interview with, directors Joe and Anthony Russo -- who also helmed the upcoming "Captain America: Civil War" -- confirmed that Chris Pratt's Star-Lord from "Guardians of the Galaxy" will pop up in "Infinity." As Anthony Russo explained to the site, the "Infinity War" movies (which are split into two parts) are "intended to be a culmination of everything that's happened before in the MCU," and that includes the far-flung, space-set adventures of Star-Lord.

"[Joe Russo and I] are both big fans of what James Gunn has done," Anthony said of the "Guardians" director. "Star-Lord is a fantastic character and Chris Pratt is an awesome performer so you'd be very excited [about his appearance in 'Infinity']."

And that's not all. According to the brothers, Thor (Chris Hemsworth) has also been confirmed to join the "Infinity War" proceedings, and that will directly tie in with what happens in the character's next solo flick, due out in 2017.

"I'm excited to work with Thor," Joe Russo told "They're doing some really interesting stuff with 'Ragnarok' and where he's gonna be at the beginning of 'Infinity War' is gonna be a very interesting place and I think very profound. I think he's gonna have a real emotional motivation after that."

"Avengers: Infinity War - Part 1" is due in theaters on May 4, 2018.