Mantis was apparently killed by the Magus, who, upon anticipating that Mantis would use her mental powers to incapacitate him, struck her and her fellow psionic Cosmo dead with a powerful blast of energy. However, it was revealed that she, along with fellow Guardians Phyla-Vell, Cosmo, Gamora and Major Victory are still alive, but being held prisoner in suspended animation by the Magus. She reunites with the other team of Guardians, telling Moondragon that Phyla-Vell was the first one killed by Thanos' rampage.