This article contains spoilers for All-Out Avengers #1
Marvel's Doctor Doom is now capable of wielding Thor's hammer Mjolnir - and the concept of who is and isn't worthy of lifting the enchanted weapon just became very complicated. Victor Von Doom is one of Marvel's most famous villains, and perhaps the most diabolical; Doom is a dictator of Latveria who has no qualms about murdering anyone who gets in his way, and seeks to rule the Earth (and the space beyond). Now, All-Out Avengers #1 challenges that idea as Doom holds a weapon that is usually only wielded by heroes.
Doctor Doom began his Marvel history as a Fantastic Four villain in the Silver Age, but quickly escaped the book of Marvel's First Family to wreak havoc on the Marvel Universe as a whole. Doctor Doom has worked alongside multiple villains (but only out of necessity and never with the desire to make friends), and was the main villain in both Secret Wars crossover events (both in the same exact fashion: in the 1984 original he took over the Beyonder's power, and in the 2015 sequel he usurped Kang the Conqueror as the main villain). Doom is frequently on his own side, and rarely discusses his plans with anyone until they are almost complete.
In All-Out Avengers #1, written by Derek Landy with art by Greg Land, the Avengers successfully fend off an alien invasion courtesy of the Dark Tide, a malevolent force that compels Captain Marvel to turn against her fellow teammates. The team is forced to send her through a portal far away from Earth; she'll eventually turn back into Carol Danvers on the return trip. But the trial is not over, for the preview image for All-Out Avengers #2 reveals the team will fight Doctor Doom...and their only hope for salvation is, paradoxically enough, Doctor Doom. Doom holds the two most heroic weapons/symbols of the Marvel Universe: Captain America's shield and Thor's hammer.
Only a few characters have ever wielded the hammer in Marvel Comics - and fewer still have held both hammer and shield - so the fact that a ruthless dictator can lift Mjolnir is quite shocking. 2022's Hulk vs Thor: Banner of War revealed that Odin can change the enchantment, allowing Hulk and anyone to wield the hammer - but in what situation would Thor's father allow a man like Doom to hold his ancestral weapon? Perhaps Doom himself could change the enchantment, but that would give him greater magical abilities than Odin, a highly unlikely prospect.
Thus, either Doom's hammer is an illusion, or one of the most hateful villains is actually worthy of lifting Mjolnir. In order to be considered worthy of the hammer, it is not enough to be a decent, morally-upstanding person - one must be a brave warrior as well. If the hammer considers Doctor Doom worthy of the latter, it may overlook his lack of the former - meaning Thor's hammer has a mind of its own, and precisely who is and isn't "worthy" of Mjolnir changes over time.