[s3e13] Join Or Die < EXTENDED — 2025 >

: After signaling, they are attacked by Grounders emerging from the sea. These "underwater" Grounders offer them "safe passage" via a sedative, which Octavia and Jasper take to meet Luna. 3. Flashbacks: The Ark

: Flashbacks show Pike teaching the original 100 delinquents survival skills before they were sent to Earth. [S3E13] Join or Die

: Clarke, Bellamy, Octavia, and Jasper follow Lincoln’s map to find Luna, a Nightblood who can host ALIE 2.0 and stop the first AI. : After signaling, they are attacked by Grounders

: When encountering unknown factions (like Luna’s), you may have to follow unconventional "safe passage" rituals, such as the vials offered by the sea-bound Grounders. Flashbacks: The Ark : Flashbacks show Pike teaching

In this episode, the threat of ALIE spreads to Polis, forcing characters to make impossible choices between submission and physical suffering. Meanwhile, Clarke’s group searches for the elusive Luna, hoping she is the key to stopping the AI. 1. The Fall of Polis

This guide covers the core plot lines and survival stakes of the 13th episode of Season 3 of The 100 . Overview