In the Battle at the PRIDE Construction Site, the Magistrate and his family possessed various members of PRIDE and the Runaways. The Magistrate himself possessed Victor Stein, his Magistrate's Wife possessed Stacey Yorkes, his daughter possessed Tina Minoru,  and his Magistrate's Son possessed Alex Wilder.
The Magistrate's Son didn't want to leave Earth, so he offered his dad Leslie Dean's unborn child in exchange for his right to stay on Earth. After the Chase of the Magistrate's Son, the Gibborim stole the child and brought her to the Marine Vivarium Desalination Plant, where the Gibborim family prepared to activate the Gibborim Transport Device. After a disagreement between the Magistrate and his wife, they agreed to let their son join the Scrub Squad.
The Runaways arrived at the Marine Vivarium Desalination Plant, where the Magistrate and his family started the portal. They scattered in order to separate the Runaways, leading to various fights. Gert Yorkes and Molly Hernandez fight the Magistrate's Wife, Chase Stein fights the Magistrate, and Nico Minoru fights the daughter. Xavin disguised herself as the Magistrate in order to recover the child and left through the portal.
The Magistrate's family all attacked the Runaways at once, overwhelming their defense. Morgan le Fay then spoke to Minoru, telling her that the only way to save them was to use the Staff of One. She recovered a fully formed version which came out of her chest, and used a spell to send everybody their to the Dark Dimension, including the hosts of the Gibborim, defeating the aliens once and for all.
All of the humans present were taken to the Dark Dimension, and Nico Minoru inadvertently opened the door to Earth, allowing Morgan le Fay to come to Earth and being her plan to take over both worlds.