Avengers: Infinity War is going to be one of Marvel’s biggest movies to date, and so far, the best sources for spoilers has been the stars themselves. Like earlier this week, when Robert Downey Jr. welcomed Doctor Strange stars Benedict Cumberbatch and Benedict Wong to the set of Infinity War in a picture that may have revealed more than Downey intended. And it could mean a major change for Iron Man in the next Avengers film. Today’s Nerdist News is examining the evidence and offering up a few theories about Tony Stark’s new look.

There are potential spoilers ahead for Infinity War. Don’t say that you weren’t warned!

Join host and former Stark Industries analyst, Jessica Chobot, as she looks at the mystery of Tony Stark’s Arc Reactor! You may recall that Tony finally ditched the Arc Reactor in the closing moments of Iron Man 3. But if you look closely at Downey’s shirt from his post, you’ll notice that the Arc Reactor sized hole is back on his shirt again. This happens to be a story that we broke just a few minutes before anyone else online realized the potential implications.

So, what’s going on here? Is Iron Man going to be so badly injured during Infinity War that he once again needs his Arc Reactor to survive? Or is Tony going to use an Infinity Stone as the ultimate Arc Reactor power up in the battle against Thanos? There are some pretty wild ideas to explore, including the theory that Doctor Strange may have used the Time Stone to resurrect Iron Man and accidentally set him back further in his timeline. Is that crazy? Maybe. But we can’t rule it out!

Why do you think Tony Stark has an Arc Reactor again? Let’s discuss in the comment section below!