Season 5, Episode 3:

Jughead

In the Philippines, Desmond finds a local doctor, who helps Penny give birth to their son, Charlie.

Three years later, Desmond and Penny arrive at Oxford. Penny is worried about what her father will do if he finds out they are there, but Desmond insists that he has to do what he can to help Faraday and everyone else. Desmond goes to Oxford University, but they have no record of Faraday having worked there. Desmond finds Daniel's lab, and a janitor explains that the university covered up his existence after one of his experiments went wrong. He visits Daniel's ex-girlfriend, Theresa Spencer, who has been left partially comatose by his experiment. Her sister explains that Charles Widmore has paid for her treatment ever since. Desmond goes to see Widmore, who tells him where to find Daniel's mother in Los Angeles, and warns him to deliver his message and then go back into hiding, or he risks putting himself and Penny in danger.

On the Island, Miles, Charlotte and Daniel are captured by the Others in 1954, who believe that they are members of the United States Military, come to retrieve a hydrogen bomb that they left on the Island. Sawyer, Juliet and Locke have captured two Others, but one of them, revealed to be the young Charles Widmore, kills the other and escapes. Locke tracks him back to his camp, and meets Richard, who does not recognise him. Daniel admits that he is in love with Charlotte. He tells an Other named Ellie that he is from the future, and that if they bury the hydrogen bomb, everything will be fine. Locke asks Richard how to get off the Island, but there is another time flash before he can tell him, and the Others' camp disappears. Charlotte suddenly collapses, with blood gushing from her nose.

Tropes in this episode include:

• Bait-and-Switch: Desmond tells his son that they are returning to an island where he lived for a long time, that he thought he would never go back to... named Great Britain.
• Call-Back: Desmond finds Daniel's old lab from "The Constant", and a janitor mentions how his experiments involved sending a rat's brain back in time.
• Dead Guy Junior: Desmond and Penny's son is named after Charlie Pace, whose Heroic Sacrifice helped them get back together.
• Deadly Nosebleed: Charlotte's is getting worse, and by the end of the episode she has collapsed and is haemorrhaging blood from her nose.
• Emergency Temporal Shift: Daniel's plan is to use the time flashes to his advantage by stalling after being captured by the Others and waiting for a flash to take the group to a time when their camp is not around. Unfortunately, the flash comes at the wrong time for Locke, as it stops Richard from telling him how to leave the Island.
• For Want Of A Nail: Locke spares the young Widmore's life when he has the chance to shoot him because he is "one of [his] people". The future could have played out very differently if he had taken that shot. Of course, since Widmore's actions in the future are what causes Locke to time travel in the first place, it would seem Locke was always destined to let him live.
• Foreshadowing: Daniel mentioning to Ellie that she looks like somebody he knows.
• Have We Met Yet?: Locke meets Richard in 1954, before he's even been born. Naturally Richard has no idea who he is, and finds it hard to believe that Locke is his leader.
  Locke: My name is John Locke.
  Richard: Is that supposed to mean something to me?
• Just Following Orders: Richard justifies the Others killing the members of the military who brought the Jughead bomb to the Island by stating that he was ordered to kill them, implicitly by Jacob.
  Richard: Y—you answer to someone, don't you? You follow a chain of command, right?
  Daniel: Yeah.
  Richard: Yeah, well, so do I.
• Love Confession: Daniel admits that he is in love with Charlotte, as proof that he is not on a Suicide Mission to detonate the bomb.
• My Friends... and Zoidberg: When Daniel and Charlotte are reunited:
  Daniel: Charlotte! You're okay!
  Charlotte: Yeah, I'm fine!!
  Miles: (being completely ignored) I'm okay, too...
• Oh, Crap!: Daniel reacts this way when he realises the casing on the Jughead bomb is cracked.
• Pet the Dog: Charles Widmore is revealed to have financially taken care of Daniel's girlfriend Theresa for years after her mind was destroyed by one of his experiments, and gives Desmond all the information he wants in exchange for his reassurance that Penny is safe and happy.
• Politically Correct History: Averted. Ellie deduces that Faraday is not who he claims to be because of the unlikelihood of Charlotte, a British woman, and Miles, who has Chinese ancestry, being members of the United States Military in the 1950s.
• Red Shirt: The last remaining unnamed Oceanic 815 survivors who survived the flaming arrows attack in the previous episode are killed when they set off some landmines at the creek and are blown up.
• Ripple-Effect-Proof Memory: Inverted. Desmond's memory seems to have been affected by his Mental Time Travel, as he remembers visiting Faraday at Oxford but doesn't remember what year it was.
• Rock Beats Laser: It's implied that the Others killed a United States Military platoon with state-of-the-art (for the 1950s) weapons using only bows and arrows.
• Stable Time Loop:
  • Locke appears to Richard in 1954, and tells Richard that he is the leader of the Others in the future. Because of this, Richard later visits Locke when he is born, and gives the young Locke a test to see whether or not he is "special" enough to be the leader.
  • Locke refusing to shoot the young Charles Widmore ensures that he lives long enough to send the freighter to the Island, which causes Ben to move the Island, resulting in Locke being sent back in time in the first place.
  • Invoked by Daniel, who advises Ellie to bury the hydrogen bomb specifically because he already knows that the Island is still standing fifty years later, and therefore the bomb can't go off in that time.
• Title Drop: "Jughead" is the name of the hydrogen bomb left on the Island by the Military.
• Trust Password: Locke gets Richard to trust him by telling him that Jacob sent him.
• Underestimating Badassery: The young Widmore dismisses Locke as "some sodding old man" and finds the idea that Locke could track him or know the Island better than him ridiculous. He is proven very wrong.
• Wham Line: Richard reveals the identity of "Jones", the Other who escaped from Locke.
  Richard: I said put the gun down, Widmore.