Thor Girl (Tarene) is a superheroine appearing in American comic books published by Marvel Comics. Created by writer Dan Jurgens and artist John Romita Jr., the character first appeared in Thor vol. 2 #22 (April 2000). Tarene is the object of a prophecy stating that she will help life reach a new level of existence throughout the universe.

Tarene debuted in Thor vol. 2 #22 (April 2000), created by writer Dan Jurgens and artist John Romita Jr. She appeared in the 2011 Fear Itself: Youth in Revolt series.

In the beginning of time, an alien sorcerer named X'Hoss foretold the creation of the Designate, who will help evolve sentient beings to the next level of existence. Billions of years later, Tarene is born. She is told about the fate of the evil Destroyer and together with others seeks a way to stop him. In the meantime, Thanos (later retconned as a clone) obtains X'Hoss' knowledge and destroys Tarene's home-world. With Thor's help, she defeats him.

Tarene later transforms herself into an Asgardian goddess and becomes Thor's loyal ally, taking the name "Thor Girl" and the human identity of Jake Olson's "cousin" Tara. She tries to assist Thor in his adventures, aiding him in his confrontations with Gladiator, and Nullitor. She is transferred into the shell of the Destroyer by Loki, causing her to fight Thor. With the help of Amora, they find Tarene's body and Odin casts her back into her body, where she takes her vengeance on Loki. In a later battle against a revived Surtur she sacrifices nearly all of her cosmic powers to contribute the additional power needed to defeat him. Upon Odin's apparent death, Thor Girl loses most of her cosmic powers. She retains the powers she had as Thor Girl. She returns to Earth in an attempt to live a normal life as Tara Olson, but is also seen adventuring occasionally. She knows that she is destined to, and one day will, regain her full power and then some, to become the Designate.

Thor Girl is one of the heroes who registers with the Superhuman Registration Act that was forged during the 2006–2007 "Civil War" storyline. After the Superhuman Registration Act is passed, Thor Girl interferes in a jewel theft undertaken by the Grey Gargoyle, a previous foe of hers, and dispatches him, preventing the jewel heist in the process. In return, the Grey Gargoyle undertakes a lawsuit with the assistance of Mallory Book at the Superhuman Law Offices of Goodman, Lieber, Kurtzberg & Holliway.^{[volume & issue needed]}

Thor Girl is one of the first recruits for the Camp Hammond training facility. Other trainees included: Bengal, Cloud 9, Slapstick, Trauma, Armory, Rage, and Komodo.

The Initiative recruits are sent as crowd control in Manhattan with Thor Girl aiding mass evacuation when the city is attacked by the Hulk, who is seeking revenge upon the Illuminati. However, Rage breaks ranks to try to help the Avengers in battle against the Hulk and his Warbound, and Thor Girl is among the trainees who sides with Rage. Easily defeated, Thor Girl and the others are imprisoned at Manhattan Square Gardens and controlled by obedience disks. The Initiative's black ops team, including the empathic metamorph Trauma, are sent in to free Thor Girl and her compatriots, with Trauma assuming the form and powers of Thor as he battles the Warbound, leaving Thor Girl awestruck by the encounter.

Subsequent to Trauma's assumption of Thor's form, Thor Girl has expressed a kind of hero worship of and becomes enamored with Trauma.^{[volume & issue needed]} However, both Tarene and Trauma are brutally attacked by the MVP clone, calling himself KIA (Killed In Action). Tarene is badly burned while protecting Trauma, who is then stabbed in the chest by KIA.