Gremlin invasion of Tokyo

GREMLIN's invasion of Tokyo is an event introduced in Shinyaku Toaru Majutsu no Index. It occures during the Lance of Gungnir Arc. It was primary intended as a distraction for GREMLIN, necessary for the safe completion of their leader's agenda. After discovering Gremlin's base Sargasso in Tokyo Bay through Ollerus' help, they begin to raise havoc there and later fight with Academy City.