David Cassidy: Man Undercover

From Wikipedia:

David Cassidy: Man Undercover (the word "undercover" in the series title appeared at various times written as one word or two) was an American police drama starring David Cassidy, four years after his run starring in the The Partridge Family, marking his first starring role since that series was cancelled. The series was spun off after Cassidy starred in a special two-hour episode of Police Story, titled "A Chance to Live," which aired in May 1978; this episode served as the pilot for Man Undercover.

In "A Chance to Live," Cassidy portrayed undercover police officer Dan Shay, a cop who successfully infiltrates a high-school drug ring as a fellow student. Cassidy earned an Emmy Award nomination for Best Dramatic Actor for the role. He reprised the role of Officer Shay for the Man Undercover series, which aired on NBC from November 2, 1978 to July 12, 1979. Only ten episodes of the show aired prior to its cancellation.

The role of Shay's wife, portrayed in "A Chance to Live" by Dee Wallace, was recast with actress Wendy Rastatter for the actual series.

Set in Los Angeles, the series stars Cassidy as undercover police officer Dan Shay. Each episode featured Shay going undercover in a different case. Simon Oakland starred as the head of Shay's undercover team.