Buffy the Vampire Slayer (1997)

S03E12 Helpless

With her birthday drawing near, Buffy finds herself stripped of her slayer abilities just as she faces a particularly formidable and unhinged vampire. As the clock ticks down to her special day, she must confront this dangerous foe without her usual strength, leading to a thrilling showdown that tests her courage and resourcefulness in ways she never anticipated.