The pilot episode of the British police series 'The Sweeney' introduced Jack Regan, a tough detective known for his unconventional methods, which often put him at odds with his bosses rather than the criminals he's investigating.
Armchair Cinema
A flying squad officer is brutally beaten by gangsters in a London pub, but survives. However, he later dies from his injuries. This prompts the arrival of a vengeful and unconventional detective, Regan, who is determined to take down the gangsters responsible.