Reginald "Bubbles" Cousins is a fictional character on the HBO drama The Wire, played by actor Andre Royo. Bubbles is a recovering heroin addict. His real name is not revealed until a fourth-season episode when he is called "Mr. Cousins" and in the fifth-season premiere when he is called "Reginald". Bubbles has a son named KeyShawn, who lives with his mother. He is nicknamed "Bubbles" because when he is in a heroin-induced stupor, he tends to make bubbles with his spit.
Bubbles is a crucial police informant throughout the series due to his extraordinarily detailed knowledge of the streets of Baltimore and their inhabitants. Bubbles is an intelligent and compassionate man who genuinely cares about his friend Johnny Weeks and Sherrod, the teenager he informally adopts. Bubbles's struggle to deal with his addiction and make a better life for himself is a major sub-plot over the course of the series.