Fans of the Marvel Cinematic Universe have worked themselves up into a frenzy over every scrap of detail that might hint at what's going to happen in Avengers: Endgame, and they're not about to let the film's looming April 26 release stop them from running through every possibility in the meantime. Most fan theories center around the Quantum Realm from Ant-Man, and with good reason — this strange dimension offers the possibility of inter-dimensional connections, time travel, and potentially undoing the fatal Snap Heard Across the Universe. Because this plot point seems essential to the conclusion of this story, here are 15 Quantum Realm Endgame theories that are as convoluted as the space itself.
Last we saw Scott Lang, a.k.a. Ant-Man (Paul Rudd), he was unknowingly trapped in the Quantum Realm when his entire team was turned to dust by Thanos's finger snap. And yet, who should show up at Avengers headquarters in the Endgame trailer in his tricked-out van? So fans are convinced that the Quantum Realm has to be involved in the plot in a major way. Even those not completely on board that the space is the place have to be wondering: How the heck did Scott escape, and what does that mean for those trying to retrieve their other friends?
We know the Quantum Realm contains strange energy, time vortices, and alternate probabilities, all temptingly easy outs and plot devices for a fanbase desperate to see their favorites come back, and eager for answers. In the meantime the actual plot remains as mysterious as the Quantum Realm itself. But that hasn't stopped fans from trying.