10 MCU Characters Who Are Skipping Infinity War
5. Lady Sif
Jaimie Alexander's Lady Sif didn't appear in Thor: Ragnarok, and that turned out to be for the best given what happened to the Warriors Three when Hela invaded Asgard, but it seems Marvel aren't about to broach the question of her current whereabouts.
Sif wasn't included on the Infinity War cast list, so as things stand, her fate may never be addressed. An extra pair of Asgardian hands would certainly be of use to the Avengers, but it seems there was just no room left on the roster.
Alexander wasn't written out of the Thor series. She was unable to take part in the third instalment because of her commitments to the TV show Blindspot, but in story terms, she wasn't on Asgard when Hela attacked.
Whether Marvel will find a role for her at some point during Phase 4 remains to be seen, but there's a chance she could end up joining The Incredible Hulk's Leader on the list of MCU characters who were swept under the rug.