Bio: Jor-El II's direct competitor for a seat on the Science Council of Krypton.
In a worldwide broadcast, the two had to show their most useful inventions and then have the populace vote on which one they felt to be more useful. Jor-El II displayed his recently-discovered Phantom Zone projector.
Gra-Mo went next, showing off his new thought-controlled androids. It entirely malfunctioned. Gra-Mo immediately believed that Jor-El's Phantom Zone projector had somehow harmed his android. Despite the fact that later tests revealed the android was simply defective, Gra-Mo swore revenge.
He was arrested after the broadcast for having tampered with the Kryptonopolis police robots, and was the last criminal to go into one of Jor-El's pre-Phantom Zone orbiting prison ships.