The Jungle Book S01 E05 Monkey Queen

Mowgli borrows Baloo's glasses to watch butterflies, unaware he's being spied on by Masha the Bandar Log monkey, who then pinches them. Masha discovers that by wearing the glasses she has a strange power over the other monkeys who now see her as 'clever'. This goes to her head and she declares herself Queen Masha. Baloo is helpless without his glasses, so Mowgli is determined to get them back.