Carcetti learns that Greggs has been assigned the witness case and uses the information against Royce. Watkins forms an alliance with Carcetti. Now a sergeant in the major case unit, Herc takes part in a series of ill-advised raids that fail to render any significant arrests. Herc takes a video camera without permission to surveil Stanfield. Marlo tries to enlist Michael but he rejects the offer. Marlo arranges to have Omar framed for murder. Dukie debunks Randy's theory that the Chris and Snoop's victims are undead and shows him the bodies. Prez struggles to control his students' behaviour. Bubbles is beaten by another drug addict and throws Sherrod out for truanting.