McCloud - Season 7 (1976)

When a country-singing buddy of McCloud's freaks out and nearly kills a woman just before a scheduled trip to Russia, McCloud and Clifford accompany him to Moscow, hoping both to nab Russian mafiya drug pushers and help a scientist and his daughter -- who's involved in the heroin ring -- defect.

Lord Charles Bridges, a noble cat burglar, swipes his party host's prize ring and hides on a balcony just in time to witness the owner's murder; on inspecting the ring, he discovers it contains microfilm plans of Buckingham Palace and places where Irish terrorists plan to plant bombs on the Queen's birthday.

While trying to get on a squad tracking down a sniper (which he ultimately does, by accident), McCloud happens onto a series of murder scenes where the victims' blood was drained from them through bite marks in the neck, leading him to a retired horror-film actor who seems to live as Dracula.