13 Huge Marvel Movie Mysteries That Are Still Unsolved

6. Where Is Lady Sif?

Sticking with Asgard, Thor managed to lose an entire person between his two sequels and nobody seemed to notice. Perhaps because her love for Thor was inconvenient, Lady Sif was something of a loose end for Marvel after Thor: The Dark World. Especially when Thor became single again in Thor: Ragnarok, which might have given her a bit of a chance with him... If she'd actually been invited back for the film.

Even though the way the Warriors Three were killed off, they at least got some screentime to wrap up their stories: Lady Sif simply wasn't mentioned at all, meaning her last appearance on Agents Of SHIELD led her to a dead end.

Marvel have said that she was banished by Loki disguised as Odin before Ragnarok kicked off, but it's still pretty strange that she didn't return to her home when Hela's rise became clear. There's being banished and there's just being ignorant.