Shaquille O'Neal was back on the set of "Gravesend" Tuesday ... filming scenes for the mob drama while looking far more like a crime boss than a loveable basketball legend.
Check out these images TMZ Sports has obtained ... the 15-time NBA All-Star was decked out in a huge gold chain, a black track suit and some specs as cameras rolled on him for his part in the Amazon Prime series.
Playing "Mustafa," he chatted away with Jas Mathur, Floyd Mayweather's business associate who has the role of "Miguel" in the hit show.