In the run-up to The Amazing Spider-Man (Dan Slott) #700, Doctor Octopus inflicts this on Spider-Man — with the added problems that Ock's body is a) in prison and b) on its last legs after years of punishment, only barely kept alive by life support. How does Peter get out of it? Well, he kind of... doesn't. He manages to get himself out of prison, but eventually dies inside Doc Ock's body, but not before making Ock make a Heel–Face Turn, and after Peter dies, Ock vows to be a better Spider-Man than Peter ever was. A Superior Spider-Man, if you will. It's later revealed that Peter's mind was still in his own body while Ock was in control of it, combining this trope with Grand Theft Me. Ultimately, after Green Goblin set out to destroy everything Ock accomplished as Spider-Man, Ock conceded that Peter was the true Superior Spider-Man and erased himself from Peter's mind, allowing Peter to get his life back.
Doctor Doom learned the trick of switching bodies from a benign alien race called the Ovoids. He first used it quite successfully on Mr. Fantastic in Fantastic Four #10 (1963), but not that often afterwards.
Though it did save his life in the 1980s, when Doom's body was disintegrated in a battle between Terrax and the Fantastic Four. He switched bodies with a bystander at the last second.
In a hilarious case of Didn't Think This Through, Doom once switched body with Daredevil and threw him in a prison cell, but didn't tell his men about this plan beforehand. As a result, Daredevil is released from prison by Doom's men, and declares war on all of Latveria's neighbours, forcing Doom to switch his body back in order to avoid an international incident.
In a What If? story, "What If Tony Stark Became Doctor Doom?", Victor Von Doom and Tony Stark were college roommates, until Doom trapped Tony in a mind-transfer device, taking the precaution of wiping Tony's memory before swapping minds with him. Doom, in Tony's body, took over Stark International (possibly killing Howard Stark to achieve that end) and became a hugely successful Corrupt Corporate Executive. Stark, meanwhile, in a neat subversion of Easy Amnesia, never regained his memories but retained his intellect and achieved several doctorates under the name Victor Von Doom. As Von Doom, he started his own company in Latveria, and developed his own powered armor, which he used to counter "Stark" when he tried to destroy Von Doom Industries with his own powered armor. On the verge of defeat, Doom offered to restore Stark's mind to his body in exchange for amnesty, saying, "I can give you your family name back." Stark refused, saying, "You have made the name Stark synonymous with corruption and corporate avarice. Why would I covet that?"
He resorts to using it on Hulkling in Guardians of the Galaxy (2020) after the Space Sword he needed to combat the vagueness will only work for its rightful user. The Guardians push his buttons to get him to switch back, but Moondragon intervenes so he ends up in Rocket's body.
In one Excalibur story, the whole team (well, mostly) is flipped with their enemies the Crazy Gang, using a device invented by Tweedledope, a member of the villain team: Captain Britain with Tweedledope, Meggan with the Knave, Nightcrawler with the Jester, and Phoenix with the Executioner. Presumably, the villains intended to flip Shadowcat with the Red Queen, but Shadowcat escapes. Captain Britain is able to somehow access Tweedledope's skills to use the device and reverse the effect (after the usual hero-villain-free-for-all, naturally).
Sleepwalker and his human host, Rick Sheridan, ended up switching bodies for several issues after a botched attempt to release Sleepwalker while Rick was awake. In Sleepwalker's body, Rick ended up battling supervillains and supernatural horrors of the Mindscape, while Sleepy had to fill in for Rick in his human life, ironically having more success with women than Rick himself. The body swap was, in fact, a key part of the Evil Plan hatched by Big Bad Cobweb to invade the Earth and make Rick think Sleepwalker was the invasion's leader, hindering any attempt Sleepy might make to stop him.
In All-New Wolverine's first Annual, Laura swaps bodies with Spider-Gwen. The two go on an adventure to fix it, leading to the hilariously painful moment when Gwen-in-Laura's-body tried to make use of the claws, only to stab herself in the head and pass out from the pain.
Happens to Spider-Man yet again, this time with Kamala Khan in an issue of Marvel Team-Up. While the switches temporarily reverse due to an implant within Spidey's body — a precaution in case this would ever happen again, it doesn't change the fact that they're forced to spend a lot more time as each other. This leads to the usual hijinks with regards to adjusting to new powers and living different civilian lives with mixed results. Both sort of appreciate being older/younger, but have some difficulties getting around the other areas; Kamala horribly fails at impressing for a job interview due to her lack of Peter's smarts and learns about the various bills and loans he has to pay off to stay afloat, while Peter in turn not only has to deal with being a different gender, age and ethnicity (being on the receiving end of racist jokes poking at Kamala's Pakistani heritage, understanding Urdu, going through her period in the middle of class, etc.) but botches her biology presentation — ironically enough, by plagiarizing from himself.
Also happened in an Ultimate X-Men (2001)/Ultimate Spider-Man crossover, when Jean Grey got so pissed at Wolverine's constant attempts to woo her that she sent his mind to the one place he wanted to be least... High School. He ends up spending a day in Peter Parker's body, even attempting to "get busy" with MJ, while Peter, in Logan's body, went from one bad situation to another. He was understandably upset when Jean came to fix things. Then, just when it's finally over, MJ asks him if they can wait until they're older to do what "he" tried earlier.
This issue was loosely adapted as "Freaky" in the Ultimate Spider-Man (2012) cartoon, with the main difference being that Mesmero is the cause of it.
In Ultimate Fantastic Four, Doctor Doom blackmails Reed into switching bodies with him during the "Frightful" arc. Reed turns it around by attempting to pull a Heroic Sacrifice, and revealing the truth just before doing so: Doom reverses the switch rather than let Reed take the credit.
The best-known example would be the tragic flip of Psylocke and Chinese assassin Kwannon. The latter had been rendered braindead after a fall, and when Psylocke turned up amnesiac in China, Kwannon's lover Matsuo saw a chance to restore his girlfriend and turned to the villain Spiral for help. However, Spiral — being Spiral — decided that switching the women's minds would be far more entertaining, and gave both women certain aspects of the other. As a result, Psylocke got Kwannon's martial arts skills while Kwannon's mutant empathic power was given a boost by Psylocke's superior telepathy. Kwannon later joined the X-Men herself as Revanche, but would later commit suicide after contracting the Legacy Virus (aka Mutant AIDS). This used to be one of the few examples of the flip being permanent due to the extent of Spiral's tampering with the women's minds and genetic makeup, only being undone after 20 years.
Emma Frost is rather fond of this one. While still a full-time villain she swapped bodies with Storm as part of an evil plot; years later, just before her switch to heroism, she accidentally swapped bodies with Iceman, and then proceeded to fuel his (already significant) insecurities by using his powers far more effectively than he ever had. She also tried to commit suicide while in his body, but she never mentions that — and considering she's not above using her telepathic powers to make you vomit uncontrollably whenever you hear the word "broccoli", you probably shouldn't either.
Parodied in X Treme X Men 2001 once, when at a dinner party, various team members start teasing Ororo, until Kitty stands up and says, "What's everyone talking about? That isn't Storm, I'm Storm! Someone has switched our minds!" Everyone else suddenly glares at her in panicked silence. Then Ororo and Kitty shout, "GOTCHA!".
Kitty really does get switched with Micronauts villain Baron Karza in The X-Men and the Micronauts miniseries. Unfortunately, that leaves her locked into Karza's hi-tech powered armor - which he still mentally controls from his new body (including all of its speech) - so he conceals the switch and leaves her trapped as a People Puppet for a while.
During the X-Men's Australian run, there was an issue where Dazzler was accidentally switched with the criminal Diamondback. But unlike most hero/villain swaps, neither had any idea what was going on and Diamondback briefly joined the X-Men to get the matter sorted. Besides the clumsiness in getting used to each other's abilities (somehow Diamondback's Improbable Aiming Skills didn't work in Dazzler's body), Dazz was understandably quite pissed when Diamondback smoked cigars and slept with Wolverine in her body.
In X-Men Unlimited #17, Sabretooth arranges to swap bodies with Wolverine so he can gain access to Worthington Industries. He guts himself first, so that Logan will find himself in an injured body and be unable to follow him. It doesn't work.
