Okay, two ideas.
Oil Slick or Toxitron. Either one could be awesome. I think they could have either one as some sort of collector of ancient cybertronian artifacts. If either sound like Tarantulas and I would love TFP perminately.
Or............Note the name "Toxicity
". Could it be we are going to have a DOTM-esque Chernoble episode? Maybe Shockwave is like a guardian of an artifact, or is hoping to exploit the power for one of his gadgets? (C'mon Corey Burton!
Either one is possible, I'd say the second one, becuase as we all know, Hasbro likes to repeat itself