Without question, it’s gotta be Patti Smith’s Horses in the Season 2 finale of Millennium, The Time is Now, which aired May 15, 1998 as episode 23. The epic track is played as Millennium Group member Lara Means is experiencing a prolonged and frightening hallucination. She trashes the room and briefly considers suicide, while sealing something in an envelope. Frank Black, tracing Watts’ phone, locates the motel, but when he enters she hallucinates that he is a demon and tries to shoot him. He wrestles the gun away, and paramedics who accompanied him sedate her. Black discovers the envelope has his name on it and, visiting Means in an asylum, thanks her for being the only one who could truly understand his psychic powers and sympathize with him.