This was a TV-movie sequel to the 1970s hit series, with 79 year old Karl Malden returning as police Lt. Mike Stone, in 1991 investigating the disappearance of his missing, retired ex-partner Steve Keller.
Michael Douglas was a major movie star by this time, and that's why he wasn't available to appear in this story.
Quinn Martin was retired for years, so Aaron Spelling produced this partial reunion