Lois & Clark (1993) - 3x16 - Double Jeopardy

On their wedding night, instead of make love, Lois tells Clark that she's tired and need to sleep, leaving Clark surprised. Lex Luthor has replaced the real Lois Lane with a clone, and he wants to take the real Lois away with him. When the clone discover that Clark is Superman, she wants to stay with him, and if it's needed to kill Lois for that, she will. Lois finally escapes from Lex, but she hits her head and loses her memory. Now, she believes that she's Wanda Detroit, a character of a novel she was writing two years ago. Wanda is a woman who had a bad relationship with a man named Clark, and loves a man named Kent. She's also a singer, then, Lois begins to sing in the Bibbo Bibowski's club. Now Clark, Lex and the Clone are looking for her. Luthor finds Wanda first and convinces her that he is Kent, and tells her to act like Lois and tell Clark that she doesn't love him anymore.