History: Eddie Walker was one of Metropolis' S.C.U. operatives, nicknamed Loose Cannon for his volatile nature. His career ended in a car crash, but the crippled Loose Cannon was attacked by  Space Parasite Glonth, and the attack activated his metagene. With his new powers Loose Cannon became a superhero and helped the Justice League defeat the Space Parasites.

(Eclipso Annual #1) - Linus Powell constructed a fusion reactor that functioned as a miniature sun using a black diamond given to him by Dr. Bruce Gordon, the arch-enemy of Eclipso. They both knew Eclipso would try to stop him from using a black diamond to generate light, but the location of the observatory in the middle of the Great Salt Lake was strategic; the water serving as a natural barrier that gave Powell time to disable Eclipsoi's possessed legions using a solar battery panel. Journalist Sidney Bateman covered Powell's work for Johnny Peril's Thrill Seekers. He demonstrated the nightly repulsion of Eclipso, but Eclipso witnessed the Space Parasite Angon commit a massacre on a highway, and convinced her to attack the observatory, saying they were working on a weapon to destroy her and her brethren. Angon slaughtered Bateman and Powell's crew, and Powell valiantly if pointlessly fought back. She was impressed, and fed from his spinal fluid, activating his metagene. Eclipso entered the facility and reclaimed his diamond, destroying the reactor, and causing a huge explosion. Powell was blasted clear, and woke up learning he'd been transformed into a crystalline form with power over light. Fellow Bloodline heroes Loose Cannon, Anima, Sparx, Edge, and Nightblade found him, and offered him the chance to join them and destroy the Space Parasites. Powell, or Prism as Sparx called him, was disorientated, and they fought until he came to his senses. The heroes, with the help of Johnny Peril, fought Angon, who'd been possessed by Eclipso, and Prism banished Eclipso by turning the light of his black diamond into sunlight. He decided to stay with his new friends and finish off the Parasites.

(Villains United: Infinite Crisis Special #1) - When the Society broke out virtually every incarcerated supervillain around the world Oracle sent Loose Cannon and a number of other heroes to quell the breakout at the Slab, but a number of villains got past the heroes.

Comments: Created by Jeff Loeb & Lee Moder