Benjamin Linus is a fictional character portrayed by Michael Emerson on the ABC television series Lost. Ben was the leader of a group of island natives called the Others and was initially known as Henry Gale to the survivors of Oceanic Flight 815. He began as the main antagonist during the second and third seasons, but in subsequent seasons, becomes a morally ambiguous ally to the main characters. Other characters frequently describe him as loyal only to himself, though it is also often hinted that he may be driven by some higher purpose.

Richard Franklin Alpert is a fictional character played by Néstor Carbonell in the American ABC television series Lost. Alpert is introduced in the third season, specifically in a flashback of the character Juliet Burke, where he claims to be a doctor for a bioscience company called Mittelos Bioscience; he is later revealed to be a member of a native island faction called the Others, where he plays a role in the group's hierarchy that has been compared to that of the Panchen Lama in Buddhism by the series' producers.