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.

Charlotte Staples Lewis is a fictional character on the ABC television series Lost, played by Rebecca Mader. Charlotte is introduced in the second episode of season four and is a cultural anthropologist on a mission to the island where Oceanic Flight 815 crashed. On the island, she is held hostage by one of the plane crash survivors, John Locke, but is freed when another person from her team switches places with her. She helps prevent poison gas from being released over the island, and develops a relationship with Daniel Faraday. Charlotte dies in Daniel's arms after the frequent time traveling causes her headaches to worsen into something unexplainable.