Plot summary
Alex and Nikita decide to work together again. Sean, in a bid to protect his mother from Nikita, tracks her down through the tracker he placed in Alex's father's watch, but is captured. Knowing he is acting alone, they convince him to join their cause to defeat Percy. Birkhoff finds that Amanda placed a bug on Sean's phone to keep an eye on him. Oversight convene and realize that Division run by Amanda is no better than Percy's management, and decides to enact "Clean Sweep", a fail safe Percy set up when he formed Division, which will release VX nerve gas, which would kill everybody in Division.
Amanda learns of Percy's attempt to escape, and has placed Division on high alert for anything out of the ordinary. Realizing that the information in the black boxes will be released if Percy dies, Amanda decides to place him in an induced coma. Before the procedure starts, the guardians hold the Oversight members captive, and demand that Amanda release Percy or they will enact Clean Sweep.
Credits
Adapted from Wikipedia contributors, Nikita season 2. HTML formatting and reference markers removed.