the Avengers' feelings to create spectral copies of Loki, the Winter Soldier and Ultron to fight the heroes. Once they overcome their respective nemeses, the Avengers discover Nighthawk and Hyperion had Spectrum use the Power Prism to destroy the Squadron's home planet against his will and that the prism was a living entity in control of its host and the "true Doctor Spectrum". Ant-Man and the Falcon free Spectrum, who reverts to Roberts. In the aftermath, Roberts joins a S.H.I.E.L.D. space program so he can find a suitable new planet to reside on while the Power Prism forms its own body, assumes the Doctor Spectrum mantle, and reunites with Nighthawk. In "Avengers' Last Stand", the Power Prism joins the Squadron in enacting Nighthawk's plot against the Avengers. In "Avengers Underground", the Power Prism is defeated by Ant-Man and used by Captain America to convert the Sun's effects and render Hyperion powerless. References External links Joseph Ledger (Earth-712)—Marvel Database Doctor Spectrum (Earth-712)—Marvel Universe: The definitive online source for Marvel super hero bios.] Worlds of JMS link to the Doctor Spectrum: Full Spectrum page Articles about multiple fictional characters Characters created by John Buscema Characters created by Roy Thomas Comics characters introduced in 1969 Comics characters introduced in 1971 Fictional soldiers Marvel Comics superheroes Marvel Comics supervillains Marvel Comics titles Squadron Supreme