 When he was a child, Markley discovered he had the mutant ability to persuade people into doing whatever he wanted, simultaneously manipulating their senses.Using his power, he made millions, using his money to develop systems to enhance his abilities even further, to the point where he became- in his own words- a "more-than-perfect killing machine".After his son, Jeremy, dies as a result of trying to imitate Spider-Man, Fusion, unable to accept the fact that there was something his powers couldn't accomplish, decides to take revenge on Spider-Man.