Robert Downey Jr. took to social media on Wednesday to share a behind-the-scenes photo from the set of Avengers: Infinity War. In it, he poses with Benedict Cumberbatch, Mark Ruffalo, and BD Wong.
However, more revealing than the characters of Doctor Strange, Iron Man, the Hulk, and Wong coming together on set is a detail spotted deeper in the photo. Sitting together in costume, Downey Jr. is sporting a shirt with a certain circular hole in the chest area.
Fans of the Marvel Cinematic Universe realzie Tony Stark had his arc reactor removed from his chest by the end of Iron Man 3. So, why does he have the reactor in his chest again in the photo below?
There are several go-to theories regarding the arc reactor resurfacing.
The first is that Tony has never fought an enemy such as Thanos, nor have any of the other Avengers. The villain will be the most formidable foe they have ever come across (with the exception of Strange’s encounter with Dormammu). Tony might experience a change of heart, literally, regarding his suits in Spider-Man: Homecoming or early events of Avengers: Infinity War which lead to him needing a bit more power to take on the villain.
Then, there is the more farfetched possibility of Doctor Strange’s Eye of Agamotto being taken from him by the Mad Titan. Such a move seems inevitable but the next part is where it gets a little less likely: Thanos sends the heroes to a point in time where Stark was relying on the arc reactor to keep himself alive.
Then, of course, there is the possible connection to needing the arc reactor and going to the cosmos. Tony only scratched the surface of taking his suit to space when he diverted a nuclear missile from New York City through a wormhole into space. His suit promptly shut down so, clearly, there is room for improvement.
For one reason or another, Tony Stark will be sporting an arc reactor in Avengers: Infinity War.