The frost giants stole Thor's hammer and their leader will only give it back if Freya marries him. Heimdall has the idea of dressing Thor up as Freya to get his hammer back. He gets his hammer back and defeats the giants.
Balder had a dream of his death which frightened his mother, causing haking him invincible. Loki, who does not like Balder, disguises himself as an old lady and finds out that Balder can get injured by the mistletoe, so he carves and arrow out of one and gets his brother to shoot Balder in the heart.
Loki starts some trouble with the storm god Tjasse and he demands Idunn and her apples of youth. Loki gets Idunn to Tjasse and all the gods start aging. Loki gets Idunn and her apples back home and kills Tjasse.