AllMovie

This two-hour TV-movie spinoff of the long-running mystery series Diagnosis Murder is reminiscent of the classic "Dr. Christian" B-movies of the 1930s and 1940s. Dick Van Dyke is back as Dr. Mark Sloan, still combining his regular medical duties with sleuthing, this time for humanitarian purposes. Sloan and his colleagues are determined to stem a deadly epidemic that started in a migrant worker's camp and threatens to spread throughout Los Angeles. This requires the good doctor to journey all the way to Mexico to determine the source of the disease--and hopefully, to find an antidote. In the course of his investigation, Sloan comes to the horrifying conclusion that the epidemic is the result of a bioterrorist plot. . .and, of course, there is a murder involved. Diagnosis Murder: Without Warning made its CBS debut on April 26, 2002.