An Unfriendly Radiance begins at a nuclear facility where an ailing technician, Donald Bigelow (Joby Baker), is wrapping up his work and about to depart for Mexico with $20,000 promised by his boss, Arthur Lanz (James Wainright), for his services rendered. While pulling out of the parking lot of the facility, he loses consciousness for a few moments doing a face plant on the car horn which draws the attention of a stranger, Ray Sanchez (Ronald Joseph), who offers to help drive him to a hospital instead of the airport. Lanz watches the car go out of the lot in the opposite direction of the airport and sets out in pursuit of them, eventually catching up and running them off the road down a hillside.
Later at Danny's, Quincy (Jack Klugman) is called by Sam (Robert Ito) to assist in analyzing some strange results from the autopsy of Bigelow's body which indicate severe radiation exposure. Quincy's findings lead him to suspect there might be more to Bigelow's death than a gash on the head from the accident, and he is inclined to believe Sanchez's story that they were run off the road and he was not under the influence of the drugs that were found on him.
This is a pretty decent Season 2 episode of Quincy which has plenty of action. Although there really isn't a murder mystery here as we see who the culprits are in the beginning, there is still enough compelling drama to keep the audience entertained and interested. While the nuclear aspect of the story is pretty out there, if you don't get too hung up or focused on that element it is pretty reasonable and enjoyable.