Since this topic has come up in multiple threads, I thought I'd start one solely dedicated to this ongoing mystery. By now, the events of Uncanny X-men #600 and Extraordinary X-men #1 have been sufficiently spoiled. We saw how in one issue, Cyclops gathered the entire mutant race for a single peaceful demonstration. Then, in the next issue, he's the most reviled mutant on the face of the planet. His friends hate him. The public hates him. Pretty much everyone hates Cyclops, calling him a murderer in some cases (as though the X-men has ever had a problem with befriending murderers before). But we still have no idea what he did to put him in this position. He had already been in a similar position when he killed Charles Xavier, but there was less mystery to that. This actually sounds like it's much worse. The X-men give the impression that Cyclops is responsible for the Terrigen Mist plague that is killing and sterilizing the mutant race. They're also blaming him for the surge in hatred that humanity feels towards mutants. At this rate, they'll even blame him for global warming.

Jeff Lemire has stated on Twitter that "all will be revealed." I believe him. It will be revealed at some point. This isn't the Joker's real name. This is a major story that is now the driving force behind this new line of X-men comics. Regardless of how you feel about the direction of the X-men comics at this point, I think it's something worth contemplating.

So let's open it up. What do you think Cyclops did that was so horrible that he's the most hated character in the entire Marvel universe? I have theories and while they're always wrong, here's what I think is most likely.

1. During the 8-month gap, the Inhumans discovered a purified form of the Terrigen Mists. They wanted to release it, but then Cyclops found out that it harmed mutants. He tried to convince them to not release it, but it didn't work. The X-men and Inhumans went to war. Cyclops led the charge, but in a desperate effort to save his people, he launched an attack that caused a huge amount of collateral damage to humans. Think Samford before Civil War. And unfortunately, it wasn't enough to stop the Inhumans. They released the mists, Cyclops got the blame for the carnage, and he's now rotting in a prison cell with SHIELD. (I think this is the most likely)

2. The Inhumans release another round of Terrigen Mists without any conflict with mutants at first. Then, the dangerous side-effects are discovered. Cyclops, desperate to save his people, teams up with Sinister and allows himself to be used as a test subject to find a cure. Havok and Emma might be there too since they're MIA as well. At one point, they think they have a cure derived from Cyclops' blood. Sinister claims it's effective, but it's a trick. He lets Cyclops release it, but it ends up infecting humans as well and that's the source of all the human hatred. And since he's the one who released it, he gets all the blame. And in doing so, he gets sick as well and is now comatose. (This is my second most likely, but I think it would be a bit of a stretch)

3. During the 8-month gap, tensions rise with the Inhumans as they start to gain favor of mutants. Then, when the Terrigen Mists come along and the Inhumans do nothing, Cyclops rallies mutants like he did before and attacks the Inhumans. In the process, he taps the Phoenix Egg that he would've used in Secret Wars to turn the tide. However, he loses control and a lot of innocent people end up dying as a result. In addition, he goes missing after the battle, possibly ending up in the White Hot Room. But he still gets the blame. (I think this is by far the least likely because I have a feeling that Marvel will completely abandon the Phoenix Egg plot. That was something I think Hickman and Remender wanted to pursue. Since they're leaving, I think Marvel is just going to drop it)

These are my top three theories. I think any can work, but they're all probably dead wrong. Pretty much all my predictions are. I'm hoping there's someone on CBR who is better at this than I am. Because until Lemire reveals the truth in the comics or Rich Johnson uncovers something, we're just left with crazy fan theories.