WARNING: The following contains spoilers for Ironheart #1 by Eve Ewing, Kevin Libranda and Amy Reeder, on sale now.
For roughly the past decade or so, the Marvel Cinematic Universe's bread and butter has been adapting the characters and stories of the Marvel Universe for the big screen. In this regard, the river typically flows one way. Marvel Comics properties are adapted for film, but it's rare to see MCU arcs adapted into the comics, aside from the occasional character redesign or comic book adaptations of the films. Ironheart #1, however, bucks this trend by introducing into the Marvel Universe a supervillain terrorist organization that has only ever existed in the MCU Iron Man series. That group is the Ten Rings.
The Ten Rings are the primary antagonists of the Iron Man film franchise, though this might come as a surprise to some, given the group's existence and goals were largely overshadowed by eccentric villains like Jeff Bridges' Obadiah Stane and Mickey Rourke's Whiplash. It wasn't until the ever-changing cup game that was Iron Man 3 that the organization was better fleshed out… kind of. To put it simply, the Ten Rings are dedicated to the complete and utter destruction of world peace, and, understandably, they use some pretty violence means to achieve their goals.
For example, Tony Stark's abduction and subsequent enslavement in Afghanistan? Yep, that was the Ten Rings. Whiplash's bloody, revenge-fueled tear? Yeah, that was empowered by the Ten Rings, too. The group's name (and the name of its leader) was even coopted in Iron Man 3, which did not please the group and resulted in the attack on Seagate Prison to retrieve Trevor Slattery, a failed actor who had been hired to impersonate the Mandarin, true leader of the Ten Rings. The group even had a hand in trying to buy the weaponized Yellowjacket suit off Darren Cross in Ant-Man.
So, while terrorist organizations like Hydra are more recent and well-known additions to the MCU, the Ten Rings are responsible for a similar amount of misery. But perhaps the most important thing about them today is that they are MCU originals; developed for and existing solely on the screen. And now they've made the jump to comics.
The Marvel Universe's first mention of the Ten Rings can be found in Ironheart #1, which has a pretty booked schedule but manages to find the time to show Riri Williams throwing down with Clayton Cole, otherwise known as the Spider-Man villain Clash. According to Clayton, everything he's doing, which consists of kidnapping and attempting to extort foreign dignitaries using sound-based weaponry, is in service of catching the eye of the Ten Rings.