Gamora arrives on Torndune, a once-lush planet, with a mission: collect the heart of the planet. She doesn't know who sent her, why they want it, or even what the heart of a planet looks like. What she doesn't know is that her sister Nebula is in hot pursuit. Nebula has followed Gamora to Torndune in hopes of claiming the planet's heart first and shaming her sister as vengeance for the part she played in Nebula losing her arm. As they closer they get to the heart of the planet and to each other, the closer they get to uncovering the truth of what brought them there and the role may they unknowingly be playing in a twisted competition with galactic consequences.