Robert Downey Jr. has warned fans that Marvel's Avengers: Infinity War will deliver on its promise of being a high-stakes battle.

RELATED: Avengers: Infinity War Promises A Major Arc for Thor, Rocket and Groot

"Believe me, I’m tired of every movie, you know, “It’s the end! It’s Armageddon! It’s the Be All, End All, Forever!” And then it’s … not," he told Entertainment Weekly. "This one actually is. They’re not kidding. This is a heads-will-roll scenario."

Marvel Studios has spent a lot a time building up Infinity War as the culmination of 10 years of storytelling that begin in 2008 with Iron Man. Studio President Kevin Feige previously warned that, “Within the first five minutes of Infinity War, people will understand why Thanos is the biggest and baddest villain in the history of the Marvel Cinematic Universe."

RELATED: EW Covers Reveal 22 New Looks at Avengers: Infinity War Stars

Thanos has even been likened to Darth Vader in his quest for the Infinity Stones, and, as the debut trailer hinted, the Mad Titan may well be bringing a lot of death to the MCU, making Downey's words all the more ominous.

Arriving April 27, Joe and Anthony Russo's Avengers: Infinity War stars Robert Downey Jr. as Iron Man, Chris Evans as Captain America, Scarlett Johansson as Black Widow, Jeremy Renner as Hawkeye, Chris Hemsworth as Thor, Mark Ruffalo as the Hulk, Anthony Mackie as Falcon, Paul Bettany as the Vision, Elizabeth Olsen as Scarlet Witch, Don Cheadle as War Machine, Sebastian Stan as Winter Soldier, Chris Pratt as Star Lord, Dave Bautista as Drax, Bradley Cooper as Rocket, Vin Diesel as Groot, Zoe Saldana as Gamora, Karen Gillan as Nebula, Pom Klementieff as Mantis, Tom Holland as Spider-Man, Benedict Cumberbatch as Doctor Strange, Chadwick Boseman as Black Panther, Tom Hiddleston as Loki, and Josh Brolin as Thanos.