Buck Rogers in the 25th Century (1979)

S1E7 The Plot to Kill a City (2)

When a Defense Directorate agent eliminates a member of a notorious band of interstellar assassins, the group vows to retaliate against New Chicago. To infiltrate their ranks, Buck poses as an assassin, but his cover is quickly blown. Now, he faces the dual challenge of escaping from the vengeful assassins while racing against time to prevent them from blowing up the city’s matter/antimatter energy facility.