Loki is in a cell on Asgard, but since he married a mortal he can't see her. Loki's wife, Jax, is the black witch and plans to get Loki out. Loki and Jax always did things together, even if it was evil.

Jax is Tony Starks oldest daughter and an Avenger, but Jax is pregnant with Loki's kid so Jax has to wait to get Loki out. Thor and Tony know Jax is married to Loki.

Odin calls the Avengers to Asgard, Jax goes with them. Jax stays close to Wanda, since wanda helps Jax with her pregnancy.