Gods go to the Well of Urd to ask the Norns about their future regarding Loki's three new kids from Jotunheim.
The Norns predict that the three kids will kill Odin and Thor.
Odin had his army capture the three kids(Fenrir the wolf, Hel, and Midgard Snake) in Jotunheim and bring them back to him in Asgard.
When Loki's kids were brought to Odin he sent Hel to Niflheim, where she became the ruler of the dead.
The Midgard Serpent was thrown into the sea by Odin, and it immediately grew so long it wrapped around Midgard.
Odin decided Fenrir was too dangerous too let out his sight. But the wolf Fenrir got stronger and bigger and kept breaking his chains. So Odin sent Skirnir to obtain an unbreakable fetter(chain) from Svartalfheim. This worked to keep Fenrir restrained.