A member of the super-hero team the Avengers published by Marvel Comics.

The real name of the woman called Mantis is unknown. She was the daughter of Gustav Brandt, a mercenary fighting in Indochina and Lua, the sister of a criminal overlord in the area, Monsieur Khrull. Khrull was infuriated by the marriage of his sister to a westerner and sought to kill them both. The two fled and soon after the birth of their daughter, were attacked by Khrull's men. Lua died and Brandt was burned and blinded by the attack. Taking his uninjured daughter, Brandt fled into the jungle, where he eventually came upon a temple of the Priests of Pama. A peaceful order, the priests were originally from the alien world of Kree.

The priests trained both Brandt and his daughter. They were able to teach Brandt to "see" again, despite the loss of his eyes. Brandt eventually left the temple and became the part of the criminal organization, the Zodiac where he served as Libra. Brandt's daughter was trained by the Priests until she had complete control over her body, enabling her to perform super-human feats. She was also trained in Kree pacifist martial arts. Because she was able to easily defeat male opponents, Brandt's daughter took for herself the name Mantis, for the insect who devours its partners after mating.

Once her training was complete, Mantis was taken to Ho Chi Minh City by the priests to live with with humans. Having wiped her memories of the temple and replaced them with false ones of being an orphan, Mantis was soon in the employ of her uncle, Monsuier Khrull, working as a waitress and prostitute.

Mantis soon met the Swordsman, a costumed mercenary who worked for Khrull. The Swordsman was an alcholoic, who Mantis saw as capable of being much more. Only after he was severely wounded did the Swordsman take her advice, seeking to join the Avengers. Mantis accompanied the Swordsman to the Avengers headquarters and was allowed to stain at the Swordsman's request.

The Avengers fought the Zodiac, reuniting Mantis with her father who revealed the circumstances of her birth and upbringing. During this time, one of the Avengers foes, Kang the Conquerer revealed to them that one of the women involved with the Avengers was the Celestial Madonna, a woman whose child would be the Celestial Messiah. Kang sought to be the father of that child though his plans were ultimately thwarted. Kang discovered and revealed to the Avengers during this time that Mantis was the Celestial Madonna.

During their battle with Kang, the Avengers lost one of their own. The Swordsman was struck by a beam from one of Kang's weapons killing him. He was buried in the garden of the temple of the Priests of Pama. Soon afterward, the Swordsman's body was reanimated by the Cotati, sentient plant beings who lived in the garden. It was revealed to Mantis, that she and the Coati could then marry and mate, creating a child who would be a new life form. The Avengers elected Mantis to full membership. She and the Cotati were married by Immortus, the master of time. The two then were transformed to pure energy and left Earth.