“Marvel’s Agents of S.H.I.E.L.D.” Season 3 is all about the Inhumans. While Coulson (Clark Gregg) and Skye (Chloe Bennet) try to build the Secret Warriors, they’ll discover that not every Inhuman wants to save the world. They’ll come up against Lash (Matthew Willig), an Inhuman who wants to fight them. A shadow of Lash in the trailer teases someone who looks decidedly different from other Inhumans, which was part of the reason he was chosen as a villain for the ABC drama.

“On a very basic level, we were interested in putting a monster in the mix, because he is not human and his looks are pretty crazy and scary,” executive producer Maurissa Tancharoen told Entertainment Weekly. “We wanted to put our team up against something like that.”

Executive producer Jed Whedon added that they wanted to show the opposite effect of the Inhuman transition. While Skye, who will now be known as Daisy, and Lincoln (Luke Mitchell) are very attractive and want to do good in the world, not everyone follows that route. “It looks like if [Daisy and Lincoln] had a baby together, that baby would rule the planet,” Whedon joked. “We want to also show the other side of the change that bad things can happen.”

Lash’s arrival was first announced at San Diego Comic-Con. Though he hadn’t been revealed as either a villain or a hero at the time, Elizabeth Henstridge (Simmons) warned that he’d bring some changes to the show. “He’s going to shake things up,” Henstridge told Zap2It. “It’s going to be a huge spectacle. We’re so honored to be able to have him in the show. It’s just huge. I can’t even explain how crazy it’s going to get.”

The announcement excited Marvel comic book fans, but the writers might not follow the source material. In the comics, Lash decided that he would judge if Inhumans were worthy of their powers. The producers warned audiences that, as usual, they’ll have their own twist on the story. “I would just say that we’re doing our own take on it,” Whedon told EW. “There will be some elements from the comics for sure, but as we always do, we want people to not know what’s coming, so we’re changing it up a little bit.”

Of course, Lash won’t be S.H.I.E.L.D.’s only enemy. They’ll also have Ward (Brett Dalton) attempting to reassemble Hydra and a new organization, the ATCU (Advanced Threat Containment Unit), causing them frustration. It looks like Season 3 will involve plenty of multitasking for Coulson’s team.

“Marvel’s Agents Of S.H.I.E.L.D.” Season 3 premieres Tuesday, Sept. 29 at 9 p.m. EDT on ABC.