Kevin Whately reprises his character Robert "Robbie" Lewis, who was Morse's sergeant in the original series.

[1] Colin Dexter, the author of the Inspector Morse novels, makes a very brief cameo appearance in several episodes, including one as a porter at Wadham College.

The episode scripts follow Dexter's approach, but each of them is credited to one of several other writers including, most frequently, Russell Lewis, Alan Plater, and Stephen Churchett.

[5] On 10 February 2014, an official announcement was made that the show was to return, with all four original main cast members coming back to do another series.

Later that year, on 21 November, Whately announced on BBC Radio Oxford that a ninth series would be made, with shooting occurring on 2015 between May and June.

[11] On 30 September 2014, Whately revealed in an interview with the Radio Times that the ninth series would be his last, having felt that he had played the character long enough for the past 30 years.

[12] His decision to leave, along with Fox's, was officially announced by ITV on 2 November 2015, with the network revealing the ninth series of Lewis would be its last.