Life on Mars S02 E07 Episode 7

"Is he mad, in a coma… or has Detective Sam Tyler really travelled back in time?"

A water-tight court case fails to put away a local gangster. Unable to cope with a guilty man walking free, DCI Hunt turns to alcohol but soon finds himself in a spot of bother. When it appears as though Hunt may have killed someone, it's up to Sam, torn between Gene and his replacement - a DCI who actually uses Sam's modern police techniques and vocabulary - to help him out.