the Squadron Sinister, when in fact it was the Squadron Supreme that appeared in both issues. The Squadron Supreme have another series of skirmishes with the Avengers engineered by the group the Serpent Cartel, but eventually team together and prevent the use of the artifact the Serpent Crown. The character and his teammates briefly feature in the title Thor, when the evil version of Hyperion attacks the Earth-712 version and then Thunder God Thor. The Squadron are mind-controlled by the entities the Overmind and Null the Living Darkness, but are freed by the Defenders and aid the heroes in defeating the villains. The character features with the Squadron Supreme in a self-titled 12-issue miniseries (Sept. 1985–Aug. 1986) by writer Mark Gruenwald. Gruenwald revealed each member's origin, with Joseph Ledger being a former astronaut who saves a Skrull in space. The grateful Skrull, called the Skrullian Skymaster, rewards Ledger with the Power Prism. The series also explains why the Squadrons Sinister and Supreme are similar: the Grandmaster creates the Squadron Sinister modelled on the already-existing Squadron Supreme of the Earth-712 universe. Gruenwald, Ryan, and inker Al Williamson created a graphic-novel sequel which maroons the team in the mainstream Marvel universe. Doctor Spectrum and teammates encounter the hero Quasar, and relocate to the government facility Project Pegasus. After another encounter with the Overmind and a visit to the laboratory world of the Stranger, the group attempts to return to their universe, and battles the entity Deathurge. The entire Squadron Supreme appear in a two-part story with the Avengers that finally returns them to their home universe, where they disband for a time. Doctor Spectrum rejoins his teammates to aid the interdimensional team the Exiles. Supreme Power The mature-audience Marvel MAX imprint showcases the adventures of the Earth-31916 version of the Squadron Supreme. The title Supreme Power relates how Joseph Ledger, a soldier in the United States Army, accidentally bonds with a crystal found in the vessel that brings Hyperion to Earth. The story continues in the limited series Doctor Spectrum, written by Sara Barnes and art by John Dell and Travel Foreman, with the experience placing Ledger in a coma, and after reliving his life in his mind for the benefit of the apparently sentient crystal, the character awakens and adopts the codename of Doctor Spectrum. Operating in a military-style uniform as opposed to a prismatic costume, Doctor Spectrum encounters and battles