Can't Burn Fire with Fire

Frank is healthy after the near death experience at the hands of the Red Death. As Jones and the other cells start to relax, Thrax returns, with no memory of his past deeds. With FPD trying to figure out how Thrax is back and what to do with him, a new evil arrives with the intent to finish what Thrax had started. Can Jones convince the virus to help Frank before its too late?