Hyperion, forming a truce with him to hunt down super-powered serial killer Michael Redstone. Doctor Spectrum also begins a tentative romance with fellow superhuman Amphibian. Both eventually join the US-backed Squadron Supreme in the 2006 title of the same name. Joseph is later killed during a battle with a version of the Squadron Sinister. The Squadron Sinister's Nighthawk is later seen examining the crystal embedded in his corpse. Squadron Supreme of America A variation of the Joseph Ledger version of Doctor Spectrum appears as a member of the Squadron Supreme of America. This version is a simulacrum created by Mephisto and programmed by the Power Elite. In his personal time, he works as a colonel in the United States Air Force. In the team's first mission, Doctor Spectrum led the Squadron Supreme of America in fighting Namor and the Defenders of the Deep, when they targeted a Roxxon oil platform off the coast of Alaska. Then, the Squadron Supreme of America visited another oil platform in the Gulf of Mexico, where Doctor Spectrum used his powers to melt areas of the oil rig to secure it from an attack by Namor. The Squadron Supreme then made short work of Namor and the Defenders of the Deep. During the War of the Realms storyline, Joseph was at his desk until he and the other members of the Squadron Supreme of America were summoned to Washington D.C., where Phil Coulson brought them up to speed with Malekith the Accursed's invasion. Doctor Spectrum leads the Squadron Supreme of America in fighting an army of Rock Trolls and Frost Giants. After the Squadron Supreme caused the Frost Giants to retreat, Phil Coulson sends them to Ohio, which has become a battleground. Doctor Spectrum led the Squadron Supreme in an attempt to apprehend Black Panther, when he infiltrated the Pentagon to confront Phil Coulson. Powers and abilities All versions of Doctor Spectrum derive their abilities from an alien gem called the Power Prism. The original prism, used by the Kenji Obatu and Billy Roberts versions of Doctor Spectrum, is a sentient being called Krimonn. Krimonn was originally a Skrull who, after failing to usurp the Skrull Emperor, was transformed into a living prism as punishment. When the Grandmaster requires champions to battle the Avengers, he retrieves the prism and grants Krimonn several energy-based powers that can be used in conjunction with a host. Kenji Obatu