An edgy janitor takes Clark's high-school class hostage at LuthorCorp, claiming his jitters were caused by a mysterious contaminant.
Tensions within the Inner Circle are at an all-time high. Lauren convinces Reed and Caitlin that they must take action to destroy Dr Risman's research.
Attempting to stabilise Reed's powers, Caitlin and Lauren meet with Dr Risman, a doctor for those with debilitating X genes. However, Dr Risman is not who Lauren thought she was.