So the choices for other movies included into the story is Race to Witch Mountain and Jupiter Ascending.
Race to Witch mountain, both Seth and Sara's people are old allies of Lorien. They were unable to help Lorien, since they themselves were going through world ending crisis.
Jupiter Ascending is slightly similar, but with Lorien Elders actually have rights to Earth, but they left it to people of Earth. So the Abrasax family or Balem has eyes on Earth, so he is trying to get the Garde first turn Earth to his side.
[The new Garde who will become the new Elders have the rights. Interesting thing is Ella, who is Setrakus Ra's daughter and Alexander, who is descendant of Pittacus Lore.Also has rights to Earth.]