"Strongest vs. Weakest" (最強VS最弱 Saikyō VS Saijaku?) is the 14th episode of the Toaru Majutsu no Index anime series and the final episode of the Sisters Arc. It was first broadcasted on January 8, 2008, with the script written by Nishizono Satoru, the episode storyboarded by Nihei Yuuichi, and directed by Sakurabi Katsushi.