Zero Hour (ゼロアワー, Zero Awā) is the first episode of the anime series, Full Metal Panic! Invisible Victory
Tessa and Leonard confront each other over their parents' graves, declaring that they will oppose each other. In Tokyo, Leonard meets Chidori and Sousuke, warning them that Amalgam will begin to take more aggressive measures to obtain Chidori and offering her to come with him. Chidori refuses, and Sousuke requests extraction from Mithril, who agree to send a helicopter to pick them up. Meanwhile, Amalgam disrupts worldwide communications and begins attacking Mithril bases, putting the whole organization in chaos. Sousuke takes Chidori to the extraction point where they are surrounded by Amalgam forces.