Heimdall is the all-seeing and all-hearing Asgardian and guard of the Bifrost Bridge. He can see and hear nearly everything that happens in the Nine Realms. He is the current guardian of the Asgard and protector of the Tesseract. Despite vowing to obey the orders of Odin, Heimdall is prepared to commit treason if it means protecting the Realms, as he allowed the Warriors Three to return Thor from Midgard to defeat Loki. When Asgard was attacked by the Dark Elves, Heimdall discovered his powers were blocked by the Elves so he was forced to once again commit treason to help Thor destroy Malekith and protect the Nine Realms.