Tania Belinskya is the daughter of Dr. Andrei Belinsky, a leader of a Soviet dissident movement that protested repressive policies of the Soviet Union.

At a young age, Belinskya had already become one of the world's greatest and most renowned neurosurgeons. After her father was exiled to Siberia for his public denunciations of Soviet policies, Belinskya decided to adopt a secret identity in order to help other dissidents and to fight crime. Belinskya named herself after the deceased Red Guardian and took a similar costume.

Doctor Strange obtained permission for Belinskya to come to the United States to perform a complicated operation on Nighthawk. Richmond was abducted from the hospital by Plant Man, and Tania joined the Defenders to help rescue him.

After having been shunned in the Soviet Union for years because of her father's opinions, Belinskya found her first true friends in the team.

She was forced to return to the Soviet Union by Sergei Krylov, the Presence. Krylov was planning to transform himself and saw Tania as his ideal mate. He used his mind control on her, and after exposure to cobalt radiation and a nuclear explosion, both were transformed into beings of nuclear energy. The Defenders both of them until Tania was able to break Presence's mind control on her. Tania had herself placed on an isolated research facility to not harm others.

Presence returned to the 'Forbidden Zone' and continued to experiment. Tania was sent to stop him, but the two stopped another irradiated monster and found that they did have feelings for one another.

The two worked together against Professor Phobos, and then left the planet hoping to make themselves inert. The enigmatic Stranger found the two. They were later released by Quasar.

Tania is attempting to keep Presence in check after a confrontation with the Avengers and the Winter Guard.