1968: TOS S02E26 ‘Assignment: Earth‘. Stardate Unknown: “Captain’s log. Using the light-speed breakaway factor, the Enterprise has moved back through time to the 20th century. We are now in extended orbit around Earth, using our ship’s deflector shields to remain unobserved. Our mission – historical research. We are monitoring Earth communications to find out how our planet survived desperate problems in the year 1968.”
After Captain Kirk finishes his log entry, suddenly the Enterprise is rocked, and Spock reports that they appear to have intercepted someone’s transporter beam. Kirk remarks that there were no such devices in the 20th century. Spock maintains that someone is beaming aboard. Spock discovers that the transporter beam originates more than a thousand light years away. Scott finds that difficult to believe, stating that no transporter beam could reach that far, not even in their time. Suddenly a man in a dark suit, holding a black cat, appears on the transporter pad. WATCH!
1993: TNG S06E18 ‘Starship Mine‘. Stardate 46682.4: On an evacuated USS Enterprise-D, Picard plays a deadly game of cat-and-mouse with terrorists who want to steal explosive toxic waste from the warp core as a lethal beam sweeps the ship. WATCH!