Mantis is raised by the living planet Ego (later revealed to also be her father) as a pet, due to her ability to use her powers to help him rest.

Mantis then goes to Titan with Quill and Drax, where they team up with Tony Stark, Peter Parker, and Stephen Strange in another attempt to wrest the Infinity Gauntlet from Thanos.

Although Mantis is able to temporarily put Thanos to sleep, he breaks free of her control when Quill learns from Nebula that Gamora died and strikes him.

[2] In 2023, Mantis is restored to life and is brought via Strange's portal to the ruins of the Avengers Compound in New York on Earth.

As the planet is under attack by the Booskans, she and Quill seek out Thor's help, who defeats the army quickly and is gifted two Indigarrian goats, who annoy her.

Mantis pilots their new ship, the Bowie, back to Earth and she and Drax land in Hollywood, Los Angeles, California.

They inadvertently make money as buskers posing for pictures on the Hollywood Walk of Fame awhile seeing various Avengers cosplayers.

Mantis accompanies the team to help Rocket in the Bowie and travels to the Orgoscope, headquarters of the High Evolutionary's company Orgocorp, in the hopes of finding an override code.

Mantis is able to persuade the Abilisks to side with them, and the three escape the chamber before reuniting with the team and overpowering the High Evolutionary's army.

[4] In May 2014, director James Gunn said that he had planned to introduce two major new characters in the Guardians of the Galaxy sequel, Mantis and Adam Warlock.

[5][6] Talks had begun with an actor Gunn had in mind to portray Mantis,[7] while he had decided to remove Warlock due to the film "getting too busy".

"[12] Dave Bautista indicated that at one point Gunn wanted to do "a Drax and Mantis film" as a spinoff, but that the concept was not pursued by Marvel.

[13] In September 2021, Gunn noted that for both Klementieff's Mantis and Karen Gillan's Nebula "their roles are both pretty huge" in the script for Guardians of the Galaxy Vol.

Mantis has the power to sense the feelings and emotions of others whom she touches, and to influence their thoughts or cause them to fall asleep, essentially mind controlling them.

In The Guardians of the Galaxy Holiday Special, she was able to instantly cause Kevin Bacon to cease resisting and voluntarily accompany herself and Drax to Knowhere, keeping him in that state for an extended period of time.