Last week, actor Benedict Wong shared an image on his Instagram from the set of Avengers 4. Or, more accurately, from a makeup trailer near the set of the upcoming movie. Regardless of where Wong was located, it’s the content in the image that has people talking.

In the picture, it looks like Wong’s skin is being peeled from his skull—it’s rather gruesome considering how realistic it looks. Does his character suffer a deadly injury in Avengers 4? Possibly, but the more likely scenario ties back to Captain Marvel.

https://www.instagram.com/p/Bn_q69jlQX6/?utm_source=ig_embed

Many are speculating that Wong’s picture is hinting at the presence of Skrulls in Avengers 4, a shapeshifting alien race capable of imitating human beings. These are the same characters confirmed to appear in the standalone Captain Marvel movie.

If the picture shared by Wong does confirm the presence of Skrulls in Avengers 4, it means our heroes won’t just have Thanos to contend with. It’s unclear why a Skrull would imitate the appearance of Wong, but considering he’s the only one left to protect the Sanctum Santorum, that might be our answer.

With so many theories floating around, what’s another rumor about Skrulls? Avengers 4 hits theaters on May 3, 2019.