 Rousseau makes her first appearance in the season one episode " Solitary " , where she captures Sayid ( Naveen Andrews ) , one of the plane crash survivors . Rousseau tortures him until he eventually convinces her that he is not one of the Others . She allows Sayid to return to his camp , and cautions him to keep a close eye on the other survivors . Over two weeks later , she comes across a delirious Claire ( Emilie de Ravin ) , who had been left in the jungle after being kidnapped by the Others . Noticing that Claire 's shouting is alerting the Others to her presence , Rousseau knocks her unconscious and carries her back to the other survivors . Rousseau makes her next appearance in " Numbers " , where she shoots at Charlie ( Dominic Monaghan ) and Hurley ( Jorge Garcia ) , suspecting them of being Others . In the season one finale , set 43 days after the plane crash , Rousseau arrives on the beach and warns everyone that the Others are coming . After Claire gives birth to her son Aaron , Rousseau steals him and intends to swap him for her own child . When the Others do not come , Rousseau reluctantly returns him to Sayid . In season two , set two weeks later , Rousseau informs Sayid that she has caught one of the Others , who later turns out to be Ben . Later , Rousseau joins Claire and Kate Austen ( Evangeline Lilly ) who are searching for medicine for Claire 's baby , in one of the Others ' work stations . Disappointed that she has not found any trace of Alex , she begins to leave them when Claire tells her that she believes Alex helped her escape when the Others captured her . 
