Buck Rogers in the 25th Century

Season 1, Episode 6

Episode Title: The Plot to Kill a City (1)

Air Date: 1979-10-11

Overview:

After a Defense Directorate agent kills a member of a group of interstellar assassins, they plot to take their revenge on the city of New Chicago. Buck masquerades as an assassin and joins the group, but is soon uncovered. He must now, not only escape from the assassins, but also stop them from detonating New Chicago's matter/antimatter energy plant.