In both the movie and comic book version of Marvel's Civil War, one hero was missing, and it was one of the most powerful in the entire universe. Thor was missing throughout both events.

The reason he was absent was different in each version of the story. In the comic books, Thor was dead and gone. In the movie, he just wasn't around, and this became a gag in a Thor short film released online where he talked about neither side inviting him.

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The most noteworthy absence of Thor during the comic book Civil War storyline. The reason for Thor's absence was two-fold, with the first being the fact that Thor was dead. Thor had just taken part in the "Final Ragnarok" and was left to rest the slumber of the gods when it concluded. This battle happened in Thor Vol. 2 in 2004, the final issue of that series showed his death. All that remained of him were the memories of the gods on Midgard.

Thor's clone Ragnarok using his powers with the Dark Avengers

He would have stayed that way, if not for one thing. Iron Man had a strand of hair from Thor that he collected at the very first Avengers meeting, and he did the unthinkable. Tony Stark and Hank Pym created a Thor clone called Ragnarok. Ragnarok first appeared in Civil War #3 (2006), created by Mark Millar and Steve Mcniven. Stark was single-minded in winning his war against Captain America and the superheroes who refused to sign the registration act. This new version of Thor took the battle to the anti-registration heroes.

That is when tragedy struck. In the pages of Civil War #4, Ragnarok proved he did not fight with dignity or honor when he struck down Bill Foster and murdered the hero known as Goliath. It was ruthless and horrific as Ragnarok shot a blast straight through Goliath's chest. He tried to kill the rest, including Falcon, Daredevil, and more, but Invisible Woman saved them with a forcefield that allowed them to escape. This event caused several heroes to switch sides, including the Invisible Woman, who left Reed Richards.

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Thor returning from the dead after the Civil War had ended. He brought Asgard to Earth and placed it in Oklahoma. Thor knew what happened with the clone and the fact that the clone murdered a hero using his name. Iron Man showed up and tried to force Thor to register, saying the government could take Asgard from him if he didn't work for them. The God of Thunder responded as only he could, by lashing out and destroying Iron Man in battle. When Iron Man asked how he got so powerful, Thor simply said this time he isn't holding back and that Tony can save his ultimatums for those too cowardly to fight back. Thor did not fight in the Civil War, and he made sure Stark knew he was the God of Thunder and not a mortal man in a metal suit.

Moving into the MCU, there was no real reason why Thor was not involved in Captain America: Civil War from a story point of view. The movie took place after Avengers: Age of Ultron, and at the end of that film, Thor returned to Asgard to figure out what was causing recent events in the MCU. This is why he wasn't around during the events of Captain America: Civil War.

Thor is the most powerful of the Avengers, and putting him on one side or the other would have been uneven without also bringing in Hulk, which the MCU chose not to do. Instead, Thor appeared in a humorous short, showing he was living with a new roommate named Darryl in Australia. He also had lunch with Bruce Banner, who said he wanted nothing to do with the Civil War while Thor asked why no one emailed him about joining in the battles.

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