John is the middle child and only son to Stakar and Aleta. Born with latent psychic abilities, he was kidnapped by his grandfather, Ogord of the Reavers of Arcturus, and mind controlled into attacking his father. His powers were unlocked as well, making him a psychic vampire.
When the Guardians of the Galaxy
removed the children from mind control, they instantly aged and died, their powers having reversed from the loss of control.