Avatar: The Last Airbender Season 2 Episode 2 : The Cave of Two Lovers
While on the way to Omashu, Aang and the group meet a group of carefree traveling bards, who take them through a vast tunnel known as the Cave of Two Lovers. Zuko and Iroh are sheltered by kind villagers after Iroh accidentally drinks tea made of a poisonous plant. Song, a young and compassionate healer, shows Zuko the effects of war from a normal citizen's perspective. Aang and Katara grow closer as they discover the origins of the cave, which includes the tombs of the first two earthbenders. In the process, they possibly share their first kiss together. Their torch burns out plunging them in darkness thus setting off the glowing lights in the ceiling, allowing the group to escape and make it to Omashu...which is under Fire Nation control.