Meltdown
Meltdown was once a brilliant biochemist named Prometheus Black. He had an intense hatred of Isaac Sumdac and was jealous of the older scientist's success. Disliking how machines did everything, Black sought to prove humanity's superiority over machines by biochemically enhancing people. He had a contract with the Detroit city government to create super-soldier police officers, and received his funding covertly through Sumdac Systems chairman Porter C. Powell, presumably as part of Powell's bid to take Sumdac Systems into the weapons development business.
His first test subject, Cyrus "The Colossus" Rhodes, went insane during a wrestling match with Bumblebee however, and caused lots of destruction. He was beaten by the Autobots. An angry Captain Fanzone terminated Black's contract. Blaming the Autobots, Black took a sample of Bumblebee's Cybertronian transmission fluid and began experimenting with it. From it he hoped to combine it with his experimental steroids to create a new super-soldier serum.
However the resulting formula was a failure, proving too corrosive for him to use. Not long afterward, Powell, disappointed with Colossus Rhodes' performance against the Autobots, cut off Black's funding. An enraged Black trashed his lab and accidentally spilled the failed formula on himself, but instead of melting him it turned him into a green slime creature whose touch burned and corroded anything. He adopted the name "Meltdown," and, remembering his hatred of Isaac Sumdac, attempted to take revenge on his rival. He was stopped by the Autobots and held prisoner within a forcefield.
Some time later, he escaped and with Colossus Rhodes' help set up a new lab on an island in the middle of Lake Erie - the same island where Prowl and Bulkhead had put the Dinobots. With his burning touch, Meltdown was able to bend the Dinobots to his will. He sent them to abduct Sumdac's daughter Sari, to bring her to the island so he could continue his experiments using her.
Prowl and Bulkhead, along with Captain Fanzone, came looking for her, and were able to defeat Meltdown's mutant henchmen. Meltdown himself was defeated after they persuaded the Dinobots to rebel against him, and Fanzone captured the evil scientist using one of his own spare "melt-proof" suits.
Later, he was freed from prison by the Dinobots who were under the control of BlackArachnia, who wanted Meltdown to help her rid herself of her organic half. Instead, Meltdown plotted to use his scientific machinery to rid her of her machine half, turning her fully organic and making her into a fully-transforming organic creature. However Optimus Prime, with help from Grimlock, was able to defeat Meltdown's henchmen and stop him, and the evil scientist accidentally got a dose of his own machine's effects, causing him to melt fully into a puddle of glop.
However after everyone left, the puddle slowly began reforming into Meltdown again, so he will undoubtedly return.
