The 100's 13th Station Reveal Was Teased Back in Season One
Spoilers for The 100 Season 3 ahead!
Last night's episode of The 100 wasn't quite as propulsive as the first few of the season, but it still had several huge developments, including the attempted massacre of yet another Grounder village, the revelation that A.L.I.E. has taken Jaha's pain away by making him forget his dead son (which was chilling, and possibly the biggest WTF moment of the season so far), and then the kicker: there was once a 13th station of the Ark which ended up in the Grounder capitol, Polis.
Here's what we know from last night's episode: there was once a 13th station named Polaris that was blown out of the sky somehow, and some of the debris ended up in Polis with the "a" and "r" burned off. The Arkers hardly ever speak of the 13th station because, as Jaha explains it, "Blowing a station out of the sky to get others to join isn't exactly a Unity Day story."
Although we've always heard about the 12 stations of the Ark, the existence (and destruction) of the 13th Station was teased back in season one. In the ninth episode, "Unity Day," the Arkers celebrated the day that the 12 separate space stations, each corresponding to one of 12 surviving nations (the U.S., Canada, Australia, Brazil, China, France, India, Russia, Japan, the UK, Uganda, and Venezuela), decided to come together to form the Ark. But during the Unity Day celebrations, which include Thanksgiving-style children's pageants, Finn tells Clarke:
"Unity Day is a lie. The Ark only came together after the 13th station was blown out of the sky. It's just not the version of history we like to tell each other at parties."
So we can presume that Polis got its name from the 13th Station, and considering that the debris is just lying around Titus' room, it might be safe to assume that Polis was actually built from the debris of the 13th station. But there are still many mysteries to unravel surrounding this reveal: who shot the 13th station out of the sky? Was it an intentional ploy to convince the other stations to unite, or did they just decide to unite after the fact?
And what does all of this have to do with A.L.I.E.? We already knew there was some kind of connection between A.L.I.E. and Grounder culture, as the "keys" to the City of Light bear the infinity symbol, which the Grounders call the "sacred symbol." The 100 Theories points out that there are wall paintings in Titus's room that show a female figure standing over a mushroom cloud, which is most likely A.L.I.E., since she caused the nuclear apocalypse, along with the "sacred symbol." Do the Grounders worship A.L.I.E. as some kind of messiah figure? I thought the A.I. plotline this season was going to be a disaster, but now I can't wait to see where it goes next.