Thor is one of the most prominent Marvel heroes, who's fought alongside the Avengers to protect Earth from the biggest threats in the universe. But, in one Thor tale, the government didn't see eye-to-eye with the God of Thunder, which resulted in a war that led to an evil Thor rising and ruling the planet.
Thor: Lord of Earth (2003) by Dan Jurgens, Scott Eaton, Cam Smith, Ian Hannin, Rob Ro, and Randy Gentile, told the story of an Earth where Thor is ruling. After helping the Earth nearly got rid of all oppression, disease, and hunger, governments around the world were ultimately threatened by his presence, leading to a war between man and gods. New York and Asgard were destroyed in the crossfire, leading Thor to take over and catalog all of humanity to be aware of any potential threats.
The issue opens in the year 2020 and Jane Foster is looking for medical attention for a disguised Scarlet Witch, who's about to give birth. She tricks Thor's allies into allowing her into their home so Wanda can give birth - which she does. Scarlet Witch gives the baby to Quicksilver, so she can go to the hospital and continue to pretend she was injured in an accident. However, Hogun, one of Thor's guards finds out she was hiding an undocumented baby, and she is summoned to New Asgard. Loki, wielding the Eye of Agamotto, acts as Thor's close confidant and head of security. Lord Thor emerges (with a newborn son) and tells Jane how he felt as New York fell.
Thor talks about how he'll never forget the "overwhelming stench of decaying bodies under the hot sun," of the more than "hundreds of thousands" of dead from the war. He talks about how the Avengers and Tony Stark tried to stop him, but he didn't tolerate resistance. The issue ends with Thor trapping Jane, Wanda, and her daughter Daiea in a bubble and saying they need to be processed.
Whether he was provoked or not, Thor was responsible for the deaths of thousands of humans. When war finally raged between him and governments, Asgard and New York fell along with tons of people caught in the crossfire. Then, Thor rules with Loki by his side, admits to fighting (and possibly torturing) the Avengers, and wants to register everybody to have control. He's a certified tyrant, and while his intentions might have been good in the first place, clearly he was corrupted and sought dominance for New Asgard. Thankfully, Lord Thor doesn't rule very long. In ensuing issues, his world would crumble around him and he ends up traveling back in time to correct the mistakes he made. While evil Thor's timeline might have been erased, it's hard to forget that one of Earth's mightiest heroes once ruled his home with an iron fist.