"Calvin Carr (Earth-616)" VS "Calvin Chadwick (Earth-199999)"
Calvin Carr (Earth-616)
Calvin Carr, Curtis Carr's younger brother, stole the alchemy gun and took the Chemistro name. At the start of his criminal career he battled Luke Cage and Iron Fist. But Curtis intervened, and helped the heroes foil his brother's plans. Calvin's alchemy gun was improved by the Wizard, who turned it into wrist blasters, and sent him and the Wrecker to attack Iron Man and Jim Rhodes during the "Acts of Vengeance." Curtis helped the heroes, and Calvin destroyed Curtis' other foot, but gave up when he was defeated by Iron Man. More recently, he joined Hood's criminal army after the events of the Super Human Civil War and helped the group in different missions, such as trying to steal Deathlok from the Owl, irrupt in Doctor Strange's Sanctum Sanctorum to take down the New Avengers, helped in defeating the Skrulls, taking revenge on the New Avengers again and helping Iron Patriot in his Siege in Asgard. But when the heroes won against Iron Patriot, Chemistro was arrested along with other members of the Hood's gang, by the U.S. Army.
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Calvin Chadwick (Earth-199999)
Calvin Chadwick was a California businessman and politician working in Hollywood in the late 1940's. He was was married to Hollywood actress Whitney Frost. Agent Peggy Carter, confronted Chadwick at a racetrack while Edwin Jarvis distracted Whitney Frost with an offer of work on a new picture. Peggy at first poses as one of his supporters, before bringing up Jane Scott and dropping the act. Chadwick denies he knows about Scott's death, and says that he cannot reveal any of Isodyne's secrets due to the company's numerous government contracts. Elsewhere, Detective Andrew Henry was shot by a rookie cop who later received an envelope of money from Chadwick and Whitney. Chadwick congratulated his wife who for figuring out how they would get out of this situation. Whitney hoped this is the last time they have to get their hands dirty.