Powers: Uni-Vision grants a cosmic consciousness, sensing things on a subatomic level and at great distances. Captain Universe can also divert energy flow in a different direction or convert it into a different type of energy.
After suffering from amnesia due to a car crash Tamara Devoux received the power of the Enigma Force, transforming her into Captain Universe. As Captain Universe she joined the Avengers to maintain the equilibrium of the whole Universe. The first mission took her to Mars to stop Ex Nihilo, Abyss and Aleph from terraforming Earth in their image. Both Ex Nihilo and Abyss recognised her as their goddess and the physical manifestation of the universe itself, immediately submitting and agreeing to her terms. Aleph however attacked and was turned to ashes with a single touch.
Tamara later discovered during therapy that she had been in a coma for ten years after her car crash and the fate of her daughter was unknown. The reason why the universe decided to become sentient was because it was broken and dying, and it chose Tamara because she was broken and dying as well. When the Avengers embarked on a mission to defeat the Builders, Tamara was captured and rendered comatose by the enemy forces until rogue Gardeners managed to use their powers to wake her up. Captain Universe arrived to the Builder Command Vessel and started defeating the Builders.
At some point, Tony Stark found her daughter, and the two were re-united. Tamara left the Avengers and began working as a waitress.