His Sister's Keeper | [s1e6]

: It is revealed that the Grounder who took Octavia, Lincoln, actually protected her and healed her leg.

: While searching for a missing Octavia in Grounder territory, Bellamy, Jasper, and Finn are confronted by Grounders. [S1E6] His Sister's Keeper

Watch how the search for Octavia unfolds and learn more about Bellamy's past in this episode overview: : It is revealed that the Grounder who

: The delinquents witness the bodies of those who died in the Ark's "Culling" entering Earth's atmosphere, mistaking them for falling stars or flares. [S1E6] His Sister's Keeper

: Flashbacks show Bellamy assisted his mother during Octavia's birth and promised to keep her a secret from the Ark's authorities.