Thor's banishment
Despite his father's weakened state, Thor is banished to Earth, losing his powers and becoming mortal. Typically, when a person as powerful as Thor is pitted against someone who is weak and embattled, they are easily able to work through their struggles. However, that is ironically not the case with his father, who strips Thor of his powers and sends him to Earth but is unable to fully deal with his trickster brother Loki, who is attempting to take over the Kingdom of Asgard.
Loki
Even though he looks nothing like a Frost Giant and doesn't have their powers, Loki is revealed to be the son of two Frost Giants. Odin reveals that he and his wife adopted Loki after defeating his mother, Laufey, many years ago in a large war.
Odinsleep
After he discovers that he is not Odin's son, Loki hatches a scheme to take control of the Kingdom of Asgard. However, his father is the rightful ruler of Asgard and entitled to its throne. Despite sensing that his kingdom was under attack, Odin unexpectedly decides to enter into a state called "Odinsleep," wherein he gains strength and recuperates. Typically, the rulers of their kingdoms work tirelessly to protect it especially when it is under threat, not go to sleep.
Mjölnir
After being banished to Earth, Thor loses control of his hammer, Mjölnir. Mjölnir can only be controlled by someone who is deemed worthy of it. For all of his life, Thor was deemed worthy of controlling the hammer. Thor never changed, but after being banished, he is no longer able to control the hammer.
