We have to go back. These 120 Lost trivia questions cover Oceanic Flight 815, Jack, Kate, Sawyer, Locke, Hurley, Sayid, Desmond, the hatch, Dharma Initiative, the Others, the smoke monster, mysterious numbers, flashbacks, flash-forwards, time travel, Jacob, and an island where almost every answer creates three new questions.
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Oceanic 815 & the Main Survivors
Q: What flight crashes on the island?
A: Oceanic Flight 815.
Q: Where is the flight traveling from?
A: Sydney.
Q: Where is it supposed to land?
A: Los Angeles.
Q: Who is the spinal surgeon who becomes a leader?
A: Jack Shephard.
Q: Who plays Jack?
A: Matthew Fox.
Q: Who is the fugitive traveling under guard?
A: Kate Austen.
Q: Who plays Kate?
A: Evangeline Lilly.
Q: Who is the con man nicknamed Sawyer?
A: James Ford.
Q: Who plays Sawyer?
A: Josh Holloway.
Q: Who is the mysterious older survivor fascinated by the island?
A: John Locke.
Q: Who plays Locke?
A: Terry O'Quinn.
Q: What physical disability did Locke have before the crash?
A: Paralysis that required a wheelchair.
Q: What happens after the crash?
A: Locke can walk.
Q: Who is the lottery winner known for saying “Dude”?
A: Hugo “Hurley” Reyes.
Q: Who plays Hurley?
A: Jorge Garcia.
Q: Who is the former Iraqi Republican Guard interrogator?
A: Sayid Jarrah.
Q: Who plays Sayid?
A: Naveen Andrews.
Q: Who are the Korean married couple?
A: Jin and Sun Kwon.
Q: Who plays Sun?
A: Yunjin Kim.
Q: Who plays Jin?
A: Daniel Dae Kim.
Q: Who is the rock musician?
A: Charlie Pace.
Q: Who plays Charlie?
A: Dominic Monaghan.
Q: What band is Charlie in?
A: Drive Shaft.
Q: What song is the band known for?
A: “You All Everybody.”
Q: Who is the pregnant Australian survivor?
A: Claire Littleton.
Q: What is Claire's baby's name?
A: Aaron.
Q: Who is Jack's half-sister?
A: Claire.
Q: When do Jack and Claire initially know this?
A: They do not know during much of their time together on the island.
Q: Who is Jack's father?
A: Christian Shephard.
Q: What is Jack transporting on the flight?
A: His father's body in a coffin.

The Hatch, Dharma Initiative & the Numbers
Q: What do Locke and Boone discover in the jungle?
A: A buried hatch.
Q: What Dharma station is beneath the hatch?
A: The Swan.
Q: Who has been living inside the Swan?
A: Desmond Hume.
Q: Who plays Desmond?
A: Henry Ian Cusick.
Q: What does Desmond call people affectionately?
A: “Brother.”
Q: What task must be performed every 108 minutes?
A: Enter the numbers into a computer and press the button.
Q: What are the famous numbers?
A: 4, 8, 15, 16, 23, 42.
Q: What number do they sum to?
A: 108.
Q: What does Hurley associate the numbers with?
A: Bad luck and a cursed lottery win.
Q: Where did Hurley first encounter them?
A: Through a patient in a mental institution and a story tied to a radio transmission.
Q: What organization built the Swan?
A: Dharma Initiative.
Q: What kind of group was Dharma?
A: A research initiative studying unusual scientific and social phenomena.
Q: What symbol appears on Dharma stations?
A: An octagonal bagua-style logo with station-specific centers.
Q: What orientation film explains the Swan?
A: A Dharma Initiative orientation video featuring Dr. Marvin Candle.
Q: What happens if the button is not pressed?
A: Electromagnetic energy builds dangerously.
Q: What happened on the day Oceanic 815 crashed?
A: Desmond failed to enter the code in time, creating an electromagnetic event linked to the crash.
Q: What does Locke eventually believe about the button?
A: He suspects it may be a psychological experiment and refuses to press it.
Q: What happens after the countdown reaches zero?
A: A system failure begins and Desmond uses the fail-safe key.
Q: What does the fail-safe do?
A: Releases or neutralizes the electromagnetic buildup, destroying the hatch.
Q: What unusual ability does Desmond develop afterward?
A: Flashes of future events.
Q: Whose death does Desmond repeatedly foresee?
A: Charlie's.
Q: What phrase is written on Charlie's hand before he dies?
A: “Not Penny's Boat.”
Q: Who is Penny?
A: Penelope Widmore, Desmond's great love.
Q: Who is Penny's father?
A: Charles Widmore.
Q: What station is used to communicate underwater?
A: The Looking Glass.
Q: How does Charlie die?
A: He drowns in the flooded Looking Glass station after warning Desmond.
Q: What song title becomes associated with Charlie's sacrifice?
A: “Greatest Hits” is the episode title and Charlie's list of life's best moments.
Q: What is the Orchid station connected to?
A: Time and space manipulation around the island.
Q: What is the Pearl station used for?
A: Observing other Dharma personnel, initially presented as monitoring experiments.
Q: Why are Dharma stations perfect trivia material?
A: Each has a name, symbol, purpose, location, and piece of island mythology.

The Others, Ben, Jacob & the Smoke Monster
Q: Who are the mysterious inhabitants called by survivors?
A: The Others.
Q: Who becomes their best-known leader?
A: Benjamin Linus.
Q: Who plays Ben?
A: Michael Emerson.
Q: Under what fake name does Ben first appear to the survivors?
A: Henry Gale.
Q: Who was the real Henry Gale?
A: A man whose balloon crashed on the island and whose grave the survivors find.
Q: What makes Ben especially dangerous?
A: Manipulation, lying, intelligence, patience, and his knowledge of the island.
Q: Who is Juliet Burke?
A: A fertility doctor recruited by the Others.
Q: Who plays Juliet?
A: Elizabeth Mitchell.
Q: What medical mystery is Juliet studying?
A: Why pregnant women die on the island after conception there.
Q: Who is Richard Alpert?
A: A long-lived adviser among the island's people.
Q: Why does Richard not age normally?
A: Jacob grants him agelessness.
Q: Who is Jacob?
A: The island's supernatural protector before the final succession.
Q: Who plays Jacob?
A: Mark Pellegrino.
Q: Who is Jacob's unnamed brother?
A: The Man in Black.
Q: What does the Man in Black become associated with?
A: The smoke monster.
Q: What can the smoke monster do?
A: Kill, scan memories, imitate dead people, and manipulate survivors.
Q: Whose form does the Man in Black use extensively late in the series?
A: John Locke.
Q: Is that actually Locke resurrected?
A: No.
Q: How does the real Locke die?
A: Ben strangles him off the island.
Q: Why is Locke's body brought back?
A: The Oceanic Six and allies believe recreating Flight 815 conditions will help them return.
Q: What flight returns many characters to the island?
A: Ajira Airways Flight 316.
Q: Who is Ilana Verdansky?
A: A woman working for Jacob who escorts candidates and protects his interests.
Q: What are “candidates”?
A: People Jacob considers as possible successors to protect the island.
Q: Where are candidate names and numbers written?
A: In Jacob's cave and lighthouse records.
Q: What candidate number is associated with Jack?
A: 23.
Q: What candidate number is associated with Hurley?
A: 8.
Q: Who becomes island protector before Hurley?
A: Jack.
Q: Who becomes protector after Jack?
A: Hurley.
Q: Who serves as Hurley's adviser?
A: Ben.
Q: What is the island's glowing source often called?
A: The Heart of the Island.

Time Travel, Finale & Hard Lost Trivia
Q: What storytelling device dominates early Lost?
A: Character flashbacks.
Q: What surprise structure appears at the end of Season 3?
A: Flash-forwards.
Q: What line reveals Jack wants to return?
A: “We have to go back!”
Q: Who are the Oceanic Six?
A: Jack, Kate, Hurley, Sayid, Sun, and Aaron as publicly presented survivors.
Q: Is Aaron biologically one of the original adult survivors?
A: No, he is Claire's baby.
Q: What lie do the Oceanic Six tell?
A: They hide the island, its survivors, and the true crash aftermath.
Q: What happens to the island physically at the end of Season 4?
A: Ben turns a wheel and the island disappears from its location.
Q: What effect does this have on some people left behind?
A: They begin skipping through time.
Q: Who explains much of the time-travel science?
A: Daniel Faraday.
Q: Who plays Faraday?
A: Jeremy Davies.
Q: What phrase describes Desmond's unusual role in time?
A: He is a “constant” or uniquely resistant variable.
Q: Who is Desmond's constant?
A: Penny.
Q: What episode centers on this?
A: “The Constant.”
Q: Where do many time travelers end up in Season 5?
A: 1970s Dharma Initiative era.
Q: What new identity does Sawyer use in Dharma?
A: Jim LaFleur.
Q: Who becomes Sawyer's partner in the Dharma years?
A: Juliet.
Q: What disaster occurs at the Swan construction site?
A: The Incident.
Q: What bomb do survivors try to detonate?
A: Jughead's nuclear core.
Q: Who falls into the electromagnetic shaft?
A: Juliet.
Q: What does Juliet do there?
A: Strikes the bomb until it detonates.
Q: What structure dominates Season 6's alternate-looking storyline?
A: Flash-sideways.
Q: Is the flash-sideways an alternate universe created by the bomb?
A: No.
Q: What is it ultimately revealed to be?
A: An afterlife-like meeting place the characters created to find one another.
Q: Did everyone on the island die in the plane crash?
A: No.
Q: Does the finale say the island events really happened?
A: Yes.
Q: Who explains the flash-sideways to Jack?
A: Christian Shephard.
Q: Where do the characters gather before moving on?
A: A church.
Q: How does Jack die?
A: After restoring the island's source, he collapses from his wounds in the bamboo forest.
Q: What does Jack see overhead?
A: Ajira Flight 316 escaping the island.
Q: What final image mirrors the pilot?
A: Jack's eye closes, reversing the pilot's opening eye.

How Did You Score?
If the numbers, Henry Gale, the Swan fail-safe, “Not Penny's Boat,” LaFleur, the candidates, the Constant, and the real meaning of the flash-sideways all came easily, your Lost trivia has found its constant.
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