At the end of Thor: The Dark World, it was revealed that Loki was alive and was posing as Odin, using his powers of illusion to do so, and sitting on the throne of Asgard. This begs the question; where is the real Odin? Surely, in the next Thor movie, we will find out. One thing is for sure - Odin is supremely powerful and, as a result, it will have taken something very powerful to have usurped him. That makes it very hard to believe that Loki achieve this feat alone. Did he use the Tesseract? Did he have an all-powerful accomplice? We will simply have to wait and see. On that note...