Supergiant was a member of Thanos' Black Order; she was a mentally unstable omnipath and telepathic parasite who seeks out intellect and devours it. In the search for Thanos' son, Supergiant and Corvus Glaive laid siege to the Jean Grey School and easily dispatched of the X-Men. They left after realising that Thanos' son was not there.
When the Black Order seized Wakanda, Supergiant was left in control of Black Bolt, whom she would mentally order to activate the bombs the Illuminati hid in Wakanda's Necropolis. When the Illuminati arrived to save Black Bolt, Supergiant used the Inhuman King's ability to defeat the heroes. Upon activating the bomb, Supergiant was faced by Maximus, who had the trigger. Maximus triggered the bomb, but also used Lockjaw to transport Supergiant along with the bomb to a distant uninhabited planet, where she perished in the explosion of the bomb.
In Avengers Assemble and Guardian of the Galaxy she is voiced by Hynden Walch who also voiced Starfire and Blackfire in Teen Titans and Teen Titans Go! and Princess Bubblegum in Adventure Time.