With its blend of humor mixed with "on the streets" grittiness, the show proved popular. The first season ranked 28th in the Nielsen ratings, but subsequent seasons failed to repeat the same level of success. The third season saw a slight revamp (including the theme music being rearranged into a more pop-driven version), with Corrigan set into place as Stacy's partner, and Captain Sheridan being dropped into the background (appearing as 'Special Guest Star' in just a few third and fourth-season episodes). The recurring character of Hooker's new boss, Lieutenant Pete O'Brien, portrayed by Hugh Farrington, was added. Lt. O'Brien was a veteran detective who was wounded in the line of duty. The injuries put him in a wheelchair but he still worked complex investigations and supervised officers. The stories started drifting toward a more straightforward cops-and-robbers fare.