Board Thread:Episode Discussion/@comment-30969686-20180306192730/@comment-4241330-20180309001436

If Scar doesn't appear, I have a suspicion that Zira and her pride could. Like, Nuka and Vitani may overhear the news and once Zira is informed, she'll order them to prevent the Guard from succeeding since Simba's life is at stake. And the cure happens to be in their part of the Outlands.

Think about it. While Scar's main ambition is to reclaim the Pridelands, Zira is obsessed with murdering Simba, which would make her a suitable choice. Then at the end of the episode (after their plan obviously fails) they'd get word of Scar's return - probably from Ushari, who I assume was sent to find them considering he wasn't in the last few episodes.