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Frank J. Lapidus is a fictional character on the ABC television series Lost played by Jeff Fahey. Frank is introduced in the second episode of season four as a pilot hired on a mission to the island where Oceanic Flight 815 crashed. He aids the survivors of the crash against mercenary Martin Keamy (Kevin Durand) and helps to rescue a group who become known as the Oceanic Six. Three years later, Frank encounters the group again while working as a commercial airline pilot. His plane lands back on the island, and he is forcibly taken in by a group of his passengers headed by Ilana (Zuleikha Robinson) and Bram (Brad William Henke), who are working for the island's highest authority figure Jacob (Mark Pellegrino).

Frank's name was created by co-executive producer Edward Kitsis, who had been pitching the name "Lapidus" for years and had also used it for an unseen character in the episode "Exposé". Fahey was the producers' first choice for the role, which was developed to suit his personality. As a result of the 2007–2008 Writers Guild of America strike, Frank's role in the first half of season four was diminished, and some planned storylines were carried over into the fifth season. Frank's introduction, along with the three other new characters from the freighter introduced in season four, was well received, as was his return in season five. Lost executive producer Damon Lindelof confirmed in an interview that Lapidus would be a series regular for the show's sixth and final season.

Originally from The Bronx, New York, Frank was the intended pilot of Oceanic Airlines Flight 815, which crashed on an island in the South Pacific. He is first encountered in Bermuda, ringing the NTSB to state that the body of the pilot of Flight 815 shown on the sea bed, on the Television news, is not who it is claimed to be. Frank reveals himself to be a conspiracy theorist who believes there are still survivors of Flight 815. He goes on to pilot a helicopter from the freighter to the island, which malfunctions on approach. His team—consisting of Daniel Faraday (Jeremy Davies), Charlotte Lewis (Rebecca Mader) and Miles Straume (Ken Leung)—parachute to safety, and Frank is able to land the helicopter without occurring significant damage.

Later, Frank disagrees with the actions of fellow freighter passenger Martin Keamy (Kevin Durand), a mercenary hired to capture island inhabitant Benjamin Linus (Michael Emerson). He helps a group of survivors avoid Keamy's team, and later attempts to resist Keamy's command. When Keamy murders the freighter's captain (Grant Bowler) in a display of power, he is forced to comply, but is able to secretly transfer a satellite phone to the survivors as a warning. When a group of survivors overpower Keamy's mercenaries, Frank attempts to fly them to safety. Due to a lack of fuel, the group—consisting of Lapidus, Sayid , Desmond, Jack Shephard (Matthew Fox), Hugo Reyes (Jorge Garcia), Kate Austen (Evangeline Lilly), Sun-Hwa Kwon (Yunjin Kim) and Aaron Littleton—crash into the ocean, where they take to a lifeboat and are later rescued by the Searcher, a ship belonging to Desmond's girlfriend Penelope Widmore (Sonya Walger).

Frank Lapidus has not been a contender in any CBUB matches.