WARNING: The following contains major spoilers for Guardians of the Galaxy #14 by Al Ewing, Juan Frigeri, Federico Blee, and VC's Cory Petit, on sale now.
The Guardians of the Galaxy have been staring down some heavy odds lately, having just defeated the cosmic demigods known as the Progenitors before being struck down by Doctor Doom. The Latverian tyrant has never needed much reason to try and wrap his iron fist tight around anything he wants, and his current focus is on the Starsword Excelsior. However, Doom's plot to steal the cosmic artifact doesn't exactly go according to plan, so Doom utilizes his strangest power:- body swapping.
Sensing death on the horizon, Doom moves to claim the Sword of Space from Emperor Hulkling, gaining not only the power of the weapon but also the power of the Kree/Skrull Alliance in the process. However, neither the Emperor nor the Guardians of the Galaxy are willing the give up the powerful weapon to Doom without a fight, leading the tyrant to utilize one of his oldest and strangest powers to effectively exchange bodies with the former Young Avenger, taking control of the weapon by way of default. As impressive as his body-swapping ability is, it leaves him in the body of Rocket Raccoon by the end of Guardians of the Galaxy #14.
Swapping bodies is nothing new for Doctor Doom, although it isn't an ability that he uses very often. The first time Doom revealed this particular power was in 1963's Fantastic Four #10 by Stan Lee and Jack Kirby, where the metal-faced tyrant switched bodies with Reed Richards. While this attempt to infiltrate and destroy the Fantastic Four proved to be a fruitless endeavor, Doom would later use this body-swapping ability to save his own life as revealed in 1986's Fantastic Four #288 by John Byrne. Believed to have been killed as a result of a battle between Terrax the Tamer and the Silver Surfer, Doom transferred his mind into the body of nearby bystander Norman McArthur before his own body was destroyed in the fray. Neither of these events proved to be as dark as Doom's actions in 2004's Fantastic Four #507 by Mark Waid and Howard Porter, in which Doom swapped bodies with Sue Storm and used her powers to slaughter several soldiers under the command of Nick Fury.
Although Doom is initially successful in achieving his goal, the Guardians have one more trick up their sleeve. Playing on the villain's well-documented sense of pride, the cosmic heroes are able to trick Doom into leaving Hulkling's body long enough for Moondragon to use her psychic abilities to transport his mind into a significantly less powerful form: Rocket Raccoon.
Being trapped in the body of Rocket Raccoon is quite possibly the worst result of Doom's body-swapping efforts in his villainous career, and it's certainly the most embarrassing. Rocket doesn't seem to mind borrowing Doom's frame for a while, which only furthers the indignity that Doom is suffering.
Being reduced to a rodent is not enough to keep Doom from being a threat, but it does limit his negotiating power. If he wants any chance to get back into his own body, it is in Doom's best interests to play nice at least until the latest intergalactic threat has been dealt with.