“Do you think I chose to be like this? Do you have any idea how lonely it is, how dangerous? I would love to be upstairs watching TV or gossiping about boys or… God, even studying! But I have to save the world. Again.”
While the whole series of Buffy the Vampire Slayer (let’s forget the original movie for now, since the television show is so much better) could be seen as an extended Girls Underground plot, I think the first season in particular exemplifies it best.
Buffy is 16 when she moves to the Hellmouth (a gateway to demon dimensions that exists – where else – underground, beneath the city of Sunnydale). Her mother is distant due to Buffy’s violent past in her previous school, and her father is absent entirely. She soon meets two companions, Willow and Xander, as well as her guide and Watcher, Giles. Together they battle the forces of darkness, led initially by the Master, an ancient vampire hoping to open the gates of the Hellmouth, and his many vampire minions. Buffy faces her adversary alone and is even initially killed, but is revived and eventually victorious.
Later seasons follow similar patterns, with a new adversary each time. An important element of the show is that Buffy is destined to be the Slayer; she is special and must save the world again and again.