Don't know if this info has already been brought up before, but this is the first i've read of BA's history. It's from: http://www.hasbro.com/transformers/animated/default.cfm?page=Bio&character=blackarachnia Potential spoilers below. "My sting will be the last thing you feel." BLACKARACHNIA started out as a promising young recruit at the AUTOBOT Academy. Accidentally abandoned on a hostile alien world by her teammates, she did the only thing she could – merged with the organic monsters that swarmed the caves in which she was trapped. Emerging as a technorganic mutant, she vowed revenge on the AUTOBOTS that had left her behind, and joined the DECEPTICONS in their war of conquest. Tech Specs Generates organic webbing stronger than steel. Mech-venom paralyzes mechanical victims. Feeds on raw Energon siphoned from machines.