Thor'svillainousuncleLokihasescapedAsgardtosearchforYggdrasil-TheTreeoftheNineRealms.ThetreeholdsthepoweroftheUniverseandishiddenawayonEarth.WiththehelpofgiantwolfgodFenrir,Lokiplanstodestroythetreeandreplantitinhisimage,givinghimdominionoverall.NowThormustfollowLokitoEarthtowageanepicbattlethatwillholdthetwoworldsinitsbalance.