ZhangFanwasattackedbyaliensonenight,andonlyescapedwiththehelpofajanitornamedAhLeandamysteriouswomannamedAnna.Bothofthemclaimedtobespiesfromthe"RelatedDepartment",whowereresponsiblefortakingcareofaliens.TheytoldZhangFanthatheusedtobeoneoftheorganization'stopspies,"AgentZ".Nowthattheearthisunderattackfromaliens,theonlythingthatcansavetheworldisAgentZ's"Cube".ButZhangFansoonfindsthattheyalsohaveulteriormotives.Havinglosthismemory,hemustsimultaneouslyrecoveritandalsofindcluesfrompreviousvideos.Afterfindingthe"Cube",ZhangFanrealizesthatAhLeisanaliendisguisedasahuman,andAnnaisanextremespywhowantstokillallaliens.TheybothusedZhangFaninordertoreachtheirgoals.ZhangFansmartlysolvestheirconflictduringtheirstandoff,butsoondiscoversthatthereisevenbiggerpowerintheshadows...