Stingers - Season 5 Episode 12 -

Undercover teams up with Armed Robbery to bust a violent robbery ring. Church infiltrates the group but is forced to bow out when he is given a shotgun and told to rob a convenience store. It looks like Undercover has blown it—until Angie uses her real-life romance with informant Marty Engle to gain access to the ring, a situation that places them both in dangerous territory.